Fair Value Disclosures [Abstract] Statement [Table] Statement [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Appalachian Power Co [Member] Appalachian Power Co [Member] Appalachian Power Company Member Indiana Michigan Power Co [Member] Indiana Michigan Power Co [Member] Indiana Michigan Power Company Member Ohio Power Co [Member] Ohio Power Co [Member] Ohio Power Company Member Public Service Co Of Oklahoma [Member] Public Service Co Of Oklahoma [Member] Public Service Company Of Oklahoma Member Southwestern Electric Power Co [Member] Southwestern Electric Power Co [Member] Southwestern Electric Power Company Member Statement [Line Items] Statement [Line Items] Fair Value Measurements Fair Value Disclosures [Text Block] Contractual Maturities Year [Axis] Contractual Maturities Year [Axis] Contractual Maturities Year Axis. Contractual Maturities Year [Domain] Contractual Maturities Year [Domain] Contractual Maturities Year Domain. Within One Year [Member] Within One Year [Member] Within One Year Member. One Year To Five Year [Member] One Year To Five Year [Member] One Year To Five Year Member. Five Year To Ten Year [Member] Five Year To Ten Year [Member] Five Year To Ten Year Member. After Ten Year [Member] After Ten Year [Member] After Ten Year Member. Schedule of Trading Securities and Other Trading Assets, Major Types of Trading Securities and Assets [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Trading Securities and Assets [Domain] (Default) Major Types of Debt and Equity Securities [Domain] Cash [Member] Cash [Member] Fixed Income Funds [Member] Fixed Income Funds [Member] Mutual Funds Fixed Income [Member] Mutual Funds Fixed Income [Member] Mutual Funds Fixed Income Variable Rate Demand Notes [Member] Variable Rate Demand Obligation [Member] Equity Securities - Domestic [Member] Equity Securities [Member] Domestic [Member] Domestic [Member] Domestic Member. Mutual Funds Equity [Member] Mutual Funds Equity [Member] Mutual Funds Equity Cash and Cash Equivalents [Member] Cash and Cash Equivalents [Member] US Government Agencies Debt Securities [Member] US Government Agencies Debt Securities [Member] Corporate Debt [Member] Corporate Debt Securities [Member] State and Local Jurisdiction [Member] State and Local Jurisdiction [Member] Book Values and Fair Values of Long - term Debt Long-term Debt, Other Disclosures [Abstract] Total Long-term Debt Outstanding Long-term Debt Long Term Debt, Fair Value Long-term Debt, Fair Value Other Temporary Investments Short-term Investments [Abstract] Cash Restricted Cash and Cash Equivalents, Current Cost Investment Owned, at Cost Gross Unrealized Gains Investment Owned, Unrecognized Unrealized Appreciation Gross Unrealized Losses Investment Owned, Unrecognized Unrealized Depreciation Estimated Fair Value Short-term Investments Debt and Equity Securities Within Other Temporary Investments [Abstract] Debt and Equity Securities Within Other Temporary Investments [Abstract] Activity for our debt and equity securities within Other Temporary Investments. Proceeds from Investment Sales Proceeds from Sale of Short-term Investments Purchases of Investments Payments to Acquire Short-term Investments Gross Realized Gains on Investment Sales Gross Realized Gains on Investment Sales On Short Term Investment Gross Realized Gains on Investment Sales On Short Term Investment. Gross Realized Losses on Investment Sales Gross Realized Losses On Investment Sales On Short Term Investment Gross Realized Losses On Investment Sales On Short Term Investment. Nuclear Trust Fund Investments [Abstract] Nuclear Trust Fund Investments [Abstract] Nuclear trust fund investments. Estimated Fair Value Spent Nuclear Fuel And Decommissioning Trusts Funds to pay for the disposal of spent nuclear fuel and the decontaminating and decommissioning of nuclear facilities through the collection of revenues from rate payers. Gross Unrealized Gains Gross Unrealized Gains Gross Unrealized Gains. Other-Than-Temporary Impairments Temporary Impairments Temporary Impairments. Securities Activity Within Decommissioning and SNF Trusts [Abstract] Securities Activity Within Decommissioning and SNF Trusts [Abstract] Securities Activity Within Decommissioning And Snf Trusts. Proceeds from Investment Sales Proceeds From Investment Sales Proceeds From Investment Sales. Purchases of Investments Purchases Of Investments Purchases of Investments. Gross Realized Gains on Investment Sales Gross Realized Gains on Investment Sales Gross Realized Gains on Investment Sales. Gross Realized Losses on Investment Sales Gross Realized Losses On Investment Sales Gross Realized Losses on Investment Sales. Contractual Maturities, Fair Value of Debt Securities Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] Contractual Maturities, Fair Value of Debt Securities Fair Value Measurements (Textuals) [Abstract] Fair Value Measurements (Textuals) [Abstract] Fair Value Measurements Textuals Abstract Other-than-temporary Impairments of Other Temporary Investments Marketable Securities, Realized Loss, Other than Temporary Impairments, Amount Other-Than-Temporary Impairments of Other Temporary Investments, Net of Tax Other than temporary impairments of Other Temporary Investments, net of tax Other-than-temporary impairments of Other Temporary Investments net of tax. Fair Value of Corporate Equity Securities with an Unrealized Loss Fair value of corporate equity securities with unrealized loss Fair value of corporate equity securities with an unrealized loss. Adjusted Cost of Debt Securities Adjusted cost of debt securities Adjusted cost of debt securities. Adjusted Cost of Domestic Equity Securities Adjusted Cost Of Equity Securities Adjusted cost of equity securities within the nuclear trusts Document and Entity Information [Abstract] Document And Entity Information. Entities [Table] Entities [Table] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Valuation Techniques Fair Value Valuation Techniques Policy [Text Block] Valuation techniques for Fair Value Measurements. Fair Values of Long-term Debt Book Values And Fair Values Of Long Term Debt Policy [Text Block] Policy for determining fair value of long-term debt. Trust Assets for Decommissioning and Spent Nuclear Fuel Disposal Trust Assets For Decommissioning And Spent Nuclear Fuel Disposal (Policy) [Text Block] Element used to describe policy for trust assets for decommissioning and spent nuclear fuel disposal. Fair Value Assets and Liabilities Measured on Recurring Basis Fair Value Assets And Liabilities Measured On Recurring Basis (Policy) [Text Block] Element describes policy for fair value assets and liabilities measured on recurring basis. Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Statement of Cash Flows [Abstract] Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net Income (Loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Adjustments to Reconcile Net Income to Net Cash Flows from (Used for) Operating Activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and Amortization Utilities Operating Expense, Depreciation and Amortization Amortization of Generation Deferrals Amortization Of Generation Deferrals Amortizations related to recoveries of pre-2012 deferred fuel balances are recovered by the Phase In Recover Rider. Amortizations related to recoveries of deferred capacity costs are recovered by the Retail Stability Rider ($1/MWH is the Distribution portion through 5/31/15). Deferred Income Taxes Deferred Income Tax Expense (Benefit) Amortization (Deferral) of Incremental Nuclear Refueling Outage Expense, Net Deferral of Incremental Nuclear Refueling Outage Expenses, Net The net cash inflow or outflow due to Cook Unit 1 & 2 refueling outage levelization. Extraordinary Item, Net of Tax Extraordinary Item, Gain (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Asset Impairments and Other Related Charges Other Asset Impairment Charges Carrying Costs Income Carrying Costs Income Income recorded to accrue a return on certain regulatory assets as granted by a regulator. Allowance for Equity Funds Used During Construction Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity Mark-to-Market of Risk Management Contracts Unrealized Gain (Loss) on Derivatives Amortization of Nuclear Fuel Amortization of Nuclear Fuel The expense charged against earnings for the periodic recognition of nuclear fuel usage. Pension Contributions to Qualified Plan Trust Pension Contributions Property Taxes Amortization of Deferred Property Taxes Fuel Over/Under-Recovery, Net Fuel Over Under Recovery Net The net change during the reporting period in the value of the asset (liability) created by an (over) under recovery of fuel costs. An over recovery represents the excess of fuel revenues billed to customers over fuel costs incurred and an under recovery represents excess fuel costs incurred over fuel revenues billed to customers. Deferral of Ohio Capacity Costs, Net Deferral Of Ohio Capacity Costs The increase (decrease) during the reporting period in amounts for the net under recovery of capacity deferrals related to the differential between $189/MW-day capacity cost and RPM (reliability pricing model) pricing. Change in Other Noncurrent Assets Increase (Decrease) in Other Noncurrent Assets Change in Other Noncurrent Liabilities Increase (Decrease) in Other Noncurrent Liabilities Changes in Certain Components of Working Capital: Increase (Decrease) in Operating Capital [Abstract] Accounts Receivable, Net Increase (Decrease) in Accounts and Other Receivables Fuel, Materials and Supplies Increase (Decrease) in Inventories Accounts Payable Increase (Decrease) in Accounts Payable Customer Deposits Increase (Decrease) in Customer Deposits Accrued Taxes, Net Increase (Decrease) in Accrued Taxes Payable Other Current Assets Increase (Decrease) in Other Current Assets Other Current Liabilities Increase (Decrease) in Other Current Liabilities Net Cash Flows from (Used for) Operating Activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Construction Expenditures Payments for Construction in Process Change in Restricted Cash for Securitized Funding Increase (Decrease) in Restricted Cash Change in Other Temporary Investments, Net Change In Other Temporary Investments Net Change in investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. Change in Advances to Affiliates, Net Increase (Decrease) in Notes Receivable, Related Parties Purchases of Investment Securities Payments to Acquire Investments Sales of Investment Securities Proceeds from Sale, Maturity and Collection of Investments Acquisitions of Nuclear Fuel Payments for Nuclear Fuel Acquisitions of Assets/Businesses Payments to Acquire Property, Plant, and Equipment Insurance Proceeds Related to Cook Plant Fire Proceeds from Insurance Settlement, Investing Activities Proceeds from Sales of Assets Proceeds from Sale of Property, Plant, and Equipment Proceeds from Notes Receivable Affiliated ProceedsFromNotesReceivableAffiliated The cash inflow from the redemption of affiliated debt. Other Investing Activities Payments for (Proceeds from) Other Investing Activities Net Cash Flows from (Used for) Investing Activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Issuance of Common Stock, Net Proceeds from Issuance of Common Stock Issuance of Long-term Debt Proceeds from Issuance of Long-term Debt Issuance of Long-term Debt - Affiliated Proceeds from Related Party Debt Credit Facility Borrowings Proceeds from Short-term Debt, Maturing in More than Three Months Change in Short-term Debt, Net Proceeds from (Repayments of) Short-term Debt, Maturing in Three Months or Less Change in Advances from Affiliates, Net Increase (Decrease) in Notes Payable, Related Parties Retirement of Long-term Debt Repayments of Long-term Debt Credit Facility Repayments Repayments of Short-term Debt, Maturing in More than Three Months Principal Payments for Capital Lease Obligations Repayments of Long-term Capital Lease Obligations Dividends Paid on Common Stock Payments of Distributions to Affiliates Dividends Paid on Common Stock Payments of Ordinary Dividends, Common Stock Other Financing Activities Proceeds from (Payments for) Other Financing Activities Net Cash Flows from (Used for) Financing Activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net Increase (Decrease) in Cash and Cash Equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and Cash Equivalents at Beginning of Period Cash and Cash Equivalents, at Carrying Value Cash and Cash Equivalents at End of Period Supplementary Information Supplemental Cash Flow Information [Abstract] Cash Paid for Interest, Net of Capitalized Amounts Interest Paid, Net Net Cash Paid (Received) for Income Taxes Income Taxes Paid, Net Noncash Acquisitions Under Capital Leases Capital Lease Obligations Incurred Construction Expenditures Included in Current Liabilities as of June 30, Construction in Progress Expenditures Incurred but Not yet Paid Acquisition of Nuclear Fuel Included in Current Liabilities as of June 30, Acquisition Of Nuclear Fuel Included In Current Liabilities Future cash outflow to pay for acquired nuclear fuel. Expected Reimbursement for Spent Nuclear Fuel Dry Cask Storage Expected Reimbursement For Spent Nuclear Fuel Dry Cask Storage Future cash inflow for nuclear fuel dry cask storage reimbursement from the DOE. Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivatives and Hedging Derivatives, Policy [Policy Text Block] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Uk Windfall Tax Issue [Member] Uk Windfall Tax Issue [Member] In May 2013 the U.S. Supreme Court decided that the U.K. Windfall Tax imposed upon U.K. electric companies privatized between 1984 and 1996 is a creditable tax for U.S. federal income tax purposes. AEP filed protective claims asserting the creditability of the tax, dependent upon the outcome of the case. Income Taxes (Textuals) [Abstract] Income Taxes (Textuals) [Abstract] Income Taxes. Reduction in Expected Future Cash Flow Increase Decrease In Expected Future Cash Flows Due To Tax Regulations Increase/(decrease) in expected future cash flows based on federal tax regulations Original WV Corporate Income Tax Rate Reduction In Income Tax Original Rate West Virginia corporate income tax rate that took effect in 2013 after reduction provided by legislation signed in 2008. Reduced WV Corporate Income Tax Rate Reduction In Income Tax New Rate West Virginia corporate income tax rate to take effect in 2014 after reduction provided by legislation signed in 2008. Unrecognized Tax Benefits Unrecognized Tax Benefits Comprehensive Income [Abstract] Comprehensive Income Comprehensive Income (Loss) Note [Text Block] Public Utilities, General Disclosures [Abstract] Regulatory Assets Not Yet Being Recovered Schedule of Regulatory Assets [Table Text Block] Compensation and Retirement Disclosure [Abstract] Benefit Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Commitments Guarantees and Contingencies [Abstract] Contractual Commitments Recorded Unconditional Purchase Obligations [Table Text Block] Maximum Future Payments of Letters of Credit Maximum Future Payments of Letters of Credit [Text Block] Maximum future payments of letters of credit. Pollution Control Bonds Supported by Bilateral Letters of Credit Pollution Control Bonds Supported by Bilateral Letters of Credit [Text Block] Pollution control bonds supported by bilateral letters of credit. Maximum Potential Loss on Master Lease Agreements Maximum Potential Loss on Master Lease Agreements [Text Block] Maximum potential loss on master lease agreements. Base Rate [Axis] Base Rate [Axis] Base Rate Axis. Base Rate [Domain] Base Rate [Domain] Base Rate Domain. APCo's Filing for IGCC Plant [Member] APCo's Filing for IGCC Plant [Member] APCo's filing for IGCC plant Cook Plant Life Cycle Management Project [Member] Cook Plant Life Cycle Management Project [Member] Cook Plant life cycle management project. Indiana Base Rate Case - 2011 [Member] Indiana Base Rate Case [Member] Indiana Base Rate Case Louisiana 2012 Formula Rate Filing [Member] Louisiana 2012 Formula Rate Filing [Member] Louisiana 2012 Formula Rate Filing. Louisiana 2014 Formula Rate Filing [Member] Louisiana 2014 Formula Rate Filing [Member] Louisiana 2014 Formula Rate Filing [Member] Ohio Electric Security Plan Filings [Member] Ohio Electric Security Plan Filing [Member] Ohio Electric Security Plan Filing Ohio Fuel Adjustment Clause Audit - 2009 [Member] Ohio Fuel Adjustment Clause Audit - 2009 [Member] 2009 Ohio Fuel Adjustment Clause Audit Ohio IGCC Plant [Member] Ohio IGCC Plant [Member] Ohio IGCC Plant Oklahoma Base Rate Case - 2014 [Member] Oklahoma Base Rate Case [Member] Oklahoma Base Rate Case [Member] Plant Transfer [Member] Plant Transfer [Member] Plant transfer. Special Rate Mechanism For Ormet [Member] Special Rate Mechanism For Ormet [Member] Special rate mechanism for Ormet. Storm Damage Recovery Rider [Member] Storm Damage Recovery Rider [Member] Storm damage recovery rider. Texas Base Rate Case - 2012 [Member] Texas Base Rate Case [Member] Texas Base Rate Case. Texas Transmission Cost Recovery Factor Filing [Member] Texas Transmission Cost Recovery Factor Filing [Member] Virginia Biennial Base Rate Case - 2014 [Member] Virginia Biennial Base Rate Case [Member] Virginia Biennial Base Rate Case [Member] Virginia Transmission Rate Adjustment Clause - 2014 [Member] Virginia Transmission Rate Adjustment Clause [Member] Virginia Transmission Rate Adjustment Clause [Member] Welsh Plant, Units 1 and 3 - Environmental Projects [Member] Welsh Plant Units 1 And 3 Environmental Projects [Member] Welsh Plant Units 1 And 3 Environmental Projects [Member] West Virginia Base Rate Case [Member] West Virginia Base Rate Case [Member] West Virginia Base Rate Case [Member] Gain Contingencies by Nature [Axis] Gain Contingencies, Nature [Axis] Gain Contingency, Nature [Domain] Gain Contingency, Nature [Domain] Applicable to West Virginia Jurisdiction [Member] Applicable to West Virginia Jurisdiction [Member] Applicable To West Virginia Jurisdiction Member. Applicable to FERC Jurisdiction [Member] Applicable to FERC Jurisdiction [Member] Applicable To FERC Jurisdiction Member. Applicable to Virginia Jurisdiction [Member] Applicable to Virginia Jurisdiction [Member] Applicable To Virginia Jurisdiction Member. Indiana Filing [Member] Indiana Filing [Member] Indiana filing. Terms Of Kentucky Power Co Memorandum Of Understanding [Member] Terms Of Kentucky Power Co Memorandum Of Understanding [Member] Terms Of Kentucky Power Co Memorandum Of Understanding Kentucky Power Co [Member] Kentucky Power Co [Member] Kentucky Power Company Member Current Regulatory Assets [Axis] Current Regulatory Assets [Axis] Current Regulatory Assets [Axis] Current Regulatory Assets [Domain] Current Regulatory Assets [Domain] Current Regulatory Assets [Domain] Deferred Fuel Costs [Member] Deferred Fuel Costs [Member] Noncurrent Regulatory Assets [Axis] Noncurrent Regulatory Assets [Axis] Noncurrent Regulatory Assets Axis Regulatory Assets [Domain] Regulatory Assets [Domain] Regulatory Assets Domain Cook Plant Turbine [Member] Cook Plant Turbine [Member] Cook Plant Turbine [Member] Deferred Capacity Costs [Member] Deferred Capacity Costs [Member] Deferred capacity costs. Expanded Net Energy Charge - Coal Inventory [Member] Expanded Net Energy Charge Coal Inventory [Member] Expanded Net Energy Charge - Coal Inventory IGCC Pre-Construction Costs [Member] IGCC Pre-Construction Costs [Member] IGCC Pre-Construction Costs [Member] Indiana Deferred Cook Plant Life Cycle Management Project Costs [Member] Indiana Deferred Cook Plant Life Cycle Management Project Costs [Member] Indiana Deferred Cook Plant Life Cycle Management Project Costs. Indiana Under-Recovered Capacity Costs [Member] Under-Recovered Capacity Costs [Member] Under-recovered Capacity Costs Mountaineer Carbon Capture and Storage Commercial Scale Facility [Member] Mountaineer Carbon Capture and Storage Commercial Scale Facility [Member] Mountaineer Carbon Capture and Storage Commercial Scale Facility. Mountaineer Carbon Capture and Storage Product Validation Facility [Member] Mountaineer Carbon Capture and Storage Product Validation Facility [Member] Mountaineer Carbon Capture and Storage Product Validation Facility Ohio Economic Development Rider [Member] Economic Development Rider [Member] Economic Development Rider. Ormet Special Rate Recovery Mechanism [Member] Ormet Delayed Payment Arrangement [Member] Ormet delayed payment arrangement. Other Regulatory Assets Pending Final Regulatory Approval [Member] Other Regulatory Assets Pending Final Regulatory Approval [Member] Other Regulatory Assets Pending Final Regulatory Approval [Member] Rate Case Expenses [Member] Rate Case Expenses [Member] Rate Case Expenses. Storm Costs [Member] Storm Costs [Member] Stranded Costs on Abandoned Plants [Member] Stranded Costs on Abandoned Plants [Member] Stranded Costs on Abandoned Plants [Member] Transmission Agreement Phase-In [Member] Transmission Agreement Phase-In [Member] Transmission Agreement Phase-In. Virginia Demand Response Program Costs [Member] Virginia Demand Response Program Costs [Member] Virginia Demand Response Program Costs [Member] Virginia Environmental Rate Adjustment Clause [Member] Virginia Environmental Rate Adjustment Clause [Member] Virginia Environmental Rate Adjustment Clause Regulatory Asset West Virginia Vegetation Management Program [Member] West Virginia Vegetation Management Program [Member] West Virginia Vegetation Management Program [Member] Regulated Status [Axis] Regulated Status [Axis] Regulated Status Axis Regulated Status [Domain] Regulated Status [Domain] Regulated Status Domain Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Assets Pending Final Regulatory Approval [Member] Regulatory Asset Return Disclosure [Axis] Regulatory Asset Return Disclosure [Axis] Regulatory Asset Return Disclosure Axis Regulatory Assets Return Disclosure [Domain] Regulatory Assets Return Disclosure [Domain] Regulatory Assets Return Disclosure Domain Regulatory Assets Currently Earning a Return [Member] Regulatory Assets Currently Earning Return [Member] Regulatory Assets Currently Earning a Return Regulatory Assets Currently Not Earning a Return [Member] Regulatory Assets Currently Not Earning Return [Member] Regulatory Assets Currently Not Earning a Return Public Utility [Axis] Public Utility [Axis] Utility Plant [Domain] Utility Plant [Domain] Big Sandy Plant, Unit 1 Natural Gas Conversion [Member] Big Sandy Plant, Unit 1 Natural Gas Conversion [Member] Big Sandy Plant, Unit 1 Natural Gas Conversion [Member] Big Sandy Plant, Unit 2 [Member] Big Sandy Plant Unit 2 [Member] Big Sandy Plant, Unit 2 Tanners Creek Plant, Units 1-4 [Member] Tanners Creek Plant Units 1 Through 4 [Member] Tanners Creek Plant, Units 1-4 Welsh Plant, Units 1 and 3 [Member] Welsh Plant Unit 1 and 3 [Member] Welsh Plant Unit 1 and 3 [Member] Welsh Plant, Unit 2 [Member] Welsh Plant Unit 2 [Member] Welsh Plant Unit 2 Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Project [Axis] Project [Axis] Project [Domain] Project [Domain] Mercury and Air Toxic Standards [Member] Mercury and Air Toxic Standards [Member] Mercury and Air Toxic Standards [Member] Regulatory Assets Not Being Recovered [Abstract] Regulatory Assets Not Being Recovered [Abstract] Regulatory Assets, Noncurrent Regulatory Assets, Noncurrent Rate Matters (Textuals) [Abstract] Rate Matters Textuals [Abstract] Rate Matters Textuals Abstract. Potential Refund of Carrying Costs Due to an Accumulated Deferred Income Tax Credit Potential Refund of Carrying Costs Due to Accumulated Deferred Income Tax Credit Amount of carrying costs that could potentially be at risk due to an accumulated deferred income tax credit. Potential Refund of Unrecognized Equity Carrying Costs Due to an Accumulated Deferred Income Tax Credit Potential Refund of Unrecognized Equity Carrying Costs Due to Accumulated Deferred Income Tax Credit Amount of unrecognized equity carrying costs that could potentially be at risk due to an accumulated deferred income tax credit. PUCO-ordered Fixed Price per MW Day for Customers Who Switch During ESP Period PUCO-Approved Fixed Price for Customers Who Switch During ESP Period PUCO-ordered fixed price per MW day for customers who switch during the electric security plan period. Reliability Pricing Model Rate per MW Day in Effect Through May 2014 Reliability Pricing Model Rate In Effect Through May 2014 Reliability pricing model rate per MW day in effect through May 2014. Reliability Pricing Model Rate per MW Day in Effect from June 2014 Through May 2015 Reliability Pricing Model Rate per MW Day in Effect from June 2014 Through May 2015 Reliability pricing model rate per MW day in effect from June 2014 through May 2015. Retail Stability Rider through May 2014 ($ Per MWh) Retail Stability Rider For Period June 2012 Through May 2014 Amount per MWh to be collected from customers under the Retail Stability Rider through May 2014. Retail Stability Rider for the Period June 2014 through May 2015 ($ per MWh) Retail Stability Rider For Period June 2014 Through May 2015 Amount per MWh to be collected from customers under the Retail Stability Rider for the period June 2014 through May 2015. Amount of Retail Stability Rider Applied to the Deferred Capacity Costs ($ per MWh) Amount Applied To Deferred Capacity Costs Amount per MWh of Retail Stability Rider collected that will be applied to the deferred capacity costs balance for the period June 2014 through May 2015. Percentage of Standard Service Offer Load Which Registrant Will Conduct an Energy Only Auction for Delivery through May 2015 Percentage Of Standard Service Offer Load Through May 2015 The percentage of Standard Service Offer load which Registrant will conduct an energy only auction for delivery through May 2015. Additional Percentage of Standard Service Offer Load Which Registrant Conducted an Energy Only Auction for Delivery Beginning November 2014 through May 2015 AdditionalPercentageOfStandardServiceOfferLoadWhichRegistrantConductedEnergyOnlyAuctionForDeliveryBeginningNovember2014ThroughMay2015 Additional Percentage of standard service offer load which registrant conducted an energy-only auction for delivery beginning November 2014 through May 2015. Additional Percentage of Standard Service Offer Load Which Registrant Will Conduct an Energy Only Auction for Delivery Beginning November 2014 through May 2015 AdditionalPercentageOfStandardServiceOfferLoadWhichRegistrantWillConductEnergyOnlyAuctionForDeliveryBeginningNovember2014ThroughMay2015 Additional Percentage of standard service offer load which registrant will conduct an energy-only auction for delivery beginning November 2014 through May 2015. Remaining Percentage of Standard Service Offer Load Which Registrant Will Conduct an Energy Only Auction for Delivery from January 2015 through May 2015 Remaining Percentage Of Standard Service Offer Load Remaining percentage of Standard Service Offer load which Registrant will conduct an energy only auction for delivery from January 2015 through May 2015. Requested Return on Equity on Capital Costs for Certain Riders Requested Return on Equity on Capital Costs for Certain Riders Requested return on equity. Estimated Average Decrease in Customer Rates Over Three Years Estimated Average Decrease in Customer Rates Over Three Years Estimated average decrease in rates over the three-year term of the proposed ESP for customers who receive their RPM and energy auction-based generation from OPCo. Intended Retail Stability Rider Rate To Be Continued Until Capacity Deferral Balance Is Collected ($ per MWh) Intended Retail Stability Rider Rate To Be Continued Until Capacity Deferral Balance Is Collected OPCo's intends to submit a separate application to continue the RSR beyond May 2015 until the balance of the capacity deferrals has been collected. Future Commitment to Support the Development of a Large Solar Farm Future Commitment To Support Development Of Large Solar Farm Future commitment to support the development of a large solar farm. Recommended Amount of Storm Cost Recovery as Approved in Stipulation Agreement Recommended Amount Of Storm Cost Recovery As Approved In Stipulation Agreement Amount of storm cost recovery approved per stipulation agreement. 2008 Coal Contract Settlement Proceeds to be Applied to Deferred Fuel Adjustment Clause as Originally Ordered by the PUCO Coal Contract Settlement Proceeds to be Applied to Deferred Fuel Balance 2008 coal contract settlement proceeds to be applied to deferred fuel balance as originally ordered by the PUCO. Net Favorable Fuel Adjustment Recorded in 2012 Based on Fuel Adjustment Clause Audit Rehearing Net Favorable Fuel Adjustment Recorded In 2012 Based On Fuel Adjustment Clause Audit Rehearing Net favorable fuel adjustment recorded in 2012 based upon a 2009 fuel adjustment clause audit rehearing. Remaining Retail Gain Not Already Flowed Through Fuel Adjustment Clause Remaining Retail Gain Not Already Flowed Through Fuel Adjustment Clause Remaining retail gain not already flowed through fuel adjustment clause. Maximum Amount of Ormet's October and November 2012 Unpaid Balance Allowed to be Recovered in the Economic Development Rider Maximum Amount Of Ormets October And November 2012 Unpaid Balance Allowed To Be Recovered In Economic Development Rider Maximum amount of Ormet's October and November 2012 unpaid balance allowed to be recovered in the Economic Development Rider. Amount of Foregone Revenues to be Collected Through the Economic Development Rider as Proposed in the Stipulation Agreement Amount Of Foregone Revenues To Be Collected Through Economic Development Rider As Proposed In Stipulation Agreement Amount of foregone revenues to be collected through the Economic Development Rider as proposed in the stipulation agreement. Amount of Foregone Revenues to be Collected Through the Economic Development Rider as Approved in the Economic Development Rider Filing Amount Of Foregone Revenues To Be Collected Through Economic Development Rider As Approved In Economic Development Rider Filing Amount of foregone revenues to be collected through the Economic Development Rider as approved in the Economic Development Rider filing. Remaining Ormet Deferral Allowed to be Requested Upon PUCO Adoption of Ormet Stipulation Agreement Remaining Ormet Deferral Allowed To Be Requested Upon Puco Adoption Of Ormet Stipulation Agreement Remaining Ormet Deferral Allowed to be Requested Upon PUCO Adoption of Ormet Stipulation Agreement Amount of Remaining Foregone Revenues Objected to by an Intervenor Amount Of Remaining Foregone Revenues Objected To By Intervenor Amount of remaining foregone revenues within the stipulation agreement objected to by an intervenor. Deferred Fuel Adjustment Clause Related to Ormet Interim Arrangement as of September 2009 Deferred Fuel Adjustment Clause Related to Ormet Interim Arrangement as of September 2009 Amount in the deferred fuel adjustment clause related to the Ormet interim arrangement including recognized carrying charges as of September 2009. Unrecognized Equity Carrying Costs Related to Ormet Interim Arrangement as of September 2009 Unrecognized Equity Carrying Costs Related to Ormet Interim Arrangement as of September 2009 Unrecognized equity carrying costs related to the Ormet interim arrangement as of September 2009. Collection of Authorized Pre-Construction Costs Collection of Authorized Pre-Construction Costs Amount collected in pre-construction costs. Property, Plant and Equipment, Net Public Utilities, Property, Plant and Equipment, Net 2013 Reversal of Previously Recorded Regulatory Disallowances 2013ReversalOfPreviouslyRecordedRegulatoryDisallowances The 2013 reversal of previously recorded regulatory disallowances. Resulting Approved Base Rate Increase Resulting Approved Base Rate Increase The resulting annual base rate increase subsequent to recent rulings by the PUCT. Requested Transmission Cost Recovery Factor Revenue Requested Transmission Cost Recovery Factor Revenue Requested initial transmission cost recovery factor revenue. Intervenor Recommended Decrease To Annual Revenue Intervenor Recommended Decrease To Annual Revenue Intervenor recommended decrease to annual revenue. Louisiana Jurisdictional Share of the Turk Plant Louisiana Jurisdictional Share Of Turk Plant Louisiana jurisdictional share of the Turk Plant. Net Increase in Louisiana Total Rates per the Settlement Agreement Net Increase In Louisiana Total Rates Net increase in Louisiana total rates per the settlement agreement. Base Rate Increase per the Settlement Agreement Base Rate Increase Per Settlement Agreement Base rate increase per the settlement agreement. Fuel Rate Decrease per the Settlement Agreement Fuel Rate Decrease Per Settlement Agreement Fuel rate decrease per the settlement agreement. Return on Common Equity per the Settlement Agreement Return On Common Equity Per Settlement Agreement Return on common equity per the settlement agreement. Requested Annual Increase Requested Annual Increase Requested annual increase. Additional Requested Annual Increase Additional Requested Annual Increase Additional requested annual increase. Requested Total Annual Increase Requested Total Annual Increase Requested total annual increase. Proposed Base Rate Surcharge Proposed Base Rate Surcharge roposed base rate surcharge to be effective upon the transfer of the Mitchell Plant to WPCo. Amount of Deferred Preconstruction IGCC Costs for Future Recovery Amount of Deferred Preconstruction IGCC Costs for Future Recovery Amount of deferred pre-construction IGCC costs for future recovery. Requested Increase in Virginia Transmission RAC Revenues Requested Increase In Virginia Transmission Rate Adjustment Clause Revenues Requested increase in Virginia transmission RAC revenues. Annual Revenue Increase as Approved in Stipulation Agreement Annual Revenue Increase As Approved In Stipulation Agreement Recommended annual revenue increase as proposed in the stipulation agreement between APCo and the Virginia SCC staff. Approved Return On Equity Approved Return On Equity Approved return on equity. Requested Annual Amortization Of Certain Deferred Costs Requested Annual Amortization Of Certain Deferred Costs Requested annual amortization of certain deferred costs. Requested Base Rate Increase Requested Base Rate Increase Requested base rate increase. Requested Return on Equity Requested Return on Equity Requested return on equity. Requested Annual Vegetation Management Rider Requested Annual Vegetation Management Rider Requested annual vegetation management rider. Proposed Depreciation Increase Included in Requested Rate Increase Proposed Depreciation Increase Included In Requested Rate Increase Proposed increase in depreciation rates included in requested base rate increase. Year One Revenues Related to Proposed Recovery of Advanced Metering Costs Year One Revenues Related To Proposed Recovery Of Advanced Metering Costs Year one revenues related to proposed recovery of advanced metering costs. Year Three Revenues Related to Proposed Recovery of Advanced Metering Costs Year Three Revenues Related To Proposed Recovery Of Advanced Metering Costs Year three revenues related to proposed recovery of advanced metering costs. Intervenor Recommended Reduction to the Requested Increase in Annual Base Rate Intervenor Recommended Reduction To Requested Increase In Annual Base Rate Intervenor recommended reduction to the requested increase in annual base rates. Intervenor Recommended Reduction in Annual Base Rates Intervenor Recommended Reduction In Annual Base Rates Intervenor recommended reduction in annual base rates. Intervenor Recommended Return on Common Equity Range Intervenor Recommended Return On Common Equity Range Intervenor recommended return on common equity. Revised Requested Base Rate Increase Revised Requested Base Rate Increase Revised requested base rate increase. Return on Common Equity for AFUDC and Factoring as Proposed in Stipulation Agreement Return on Common Equity for AFUDC and Factoring as Proposed in Stipulation Agreement Return on common equity for AFUDC and Factoring as Proposed in Stipulation Agreement. 2014 Revenues Related to Advanced Metering Costs as Proposed in Stipulation Agreement 2014 Revenues Related to Advanced Metering Costs as Proposed in Stipulation Agreement 2014 revenues related to advanced metering costs as proposed in stipulation agreement. 2016 Revenues Related to Advanced Metering Costs as Proposed in Stipulation Agreement 2016 Revenues Related to Advanced Metering Costs as Proposed in Stipulation Agreement 2016 revenues related to advanced metering costs as proposed in stipulation agreement. Approved Base Rate Increase Approved Base Rate Increase Approved base rate increase. Revised Approved Base Rate Increase Approved Base Rate Increase Adjustment Revised IURC approved base rate increase. Amount of Prepaid Pension Asset in Rate Base Opposed by Intervenor on Appeal Amount of Prepaid Pension Asset in Rate Base Opposed by Internvenor on Appeal The amount of prepaid pension asset in rate base opposed by intervenor on appeal. Projected Capital Costs Projected Capital Costs Projected capital costs of property, plant and equipment. Construction Work in Progress Construction in Progress, Gross Amount Excluded from Indiana Utility Regulatory Commission LCM Project Approval Amount Excluded From Indiana Utility Regulatory Commission LCM Project Approval The amount excluded from the Indiana Utility Regulatory Commissions approval of the LCM Project. Annual Amount of Asset Transfer Rider Annual Amount Of Asset Transfer Rider Per settlement agreement between KPCo, KIUC and the Sierra Club, the annual amount of the Asset Transfer Rider. Annual Level of Off System Sales Margins in Base Rates Above Which is Proposed to be Retained by Kentucky Power Company Annual Level Of Off System Sales Margins In Base Rates Above Which Is Retained By Kentucky Power Company Per a memorandum of understanding between KPCo, KIUC and the Sierra Club, the annual level of off-system sales margins in base rates above which is retained by KPCo. Notional Volume of Derivative Instruments Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Cash Collateral Netting Cash Collateral Netting [Text Block] Tabular disclosure of cash collateral netting. Fair Value of Derivative Instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Amount of Gain Loss Recognized on Risk Management Contracts Schedule of Derivative Instruments Included in Trading Activities [Table Text Block] Impact of Cash Flow Hedges on the Condensed Balance Sheet Impact of Cash Flow Hedges on Balance Sheet [Text Block] Tabular disclosure of the impact of cash flow hedges on the balance sheet. Collateral Required Under Various Triggering Events Collateral Required [Text Block] Tabular disclosure of the collateral required under various triggering events. Liabilities Subject to Cross Default Provisions Cross Default Provision [Text Block] Tabular disclosure of liabilities subject to cross default provisions. Rate Matters Public Utilities Disclosure [Text Block] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Variable Rate Demand Obligation [Member] Equity Securities [Member] Dedesignated Risk Management Contracts [Member] Dedesignated Risk Management Contracts [Member] Dedesignated Risk Management Contracts. Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Risk Management Commodity Contracts [Member] Risk Management Commodity Contracts [Member] Risk Management Contracts Member. Energy Contracts [Member] Energy Contracts [Member] Risk management commodity contracts whose primary underlying risk is tied energy contracts. FTRs [Member] Financial Trasnsmission Rights [Member] Risk management commodity contracts whose primary underlying risk is tied financial transmission rights. Cash Flow Hedging [Member] Cash Flow Hedging [Member] Commodity Hedges [Member] Commodity [Member] Interest Rate Foreign Currency Hedges [Member] Interest Rate Foreign Currency Hedges [Member] Fair Value Hedges [Member] Fair Value Hedging [Member] Maturity Of Fair Value Risk Management Contracts [Axis] Maturity Of Fair Value Risk Management Contracts [Axis] Maturity Year [Domain] Maturity Year [Domain] 2014 [Member] Within Current Year [Member] Maturity of risk management contracts within current year. 2015 - 2017 [Member] Maturity Period 2 [Member] 2018 - 2019 [Member] Maturity Period 3 [Member] 2017 - 2018 [Member] Maturity Period 4 [Member] 2020 - 2030 [Member] Maturity Period 5 [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value Inputs Other [Member] Fair Value Inputs Other [Member] Fair Value Inputs Other Member. Fair Value, Assets and Liabilities Measured on Recurring Basis Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract] Assets, Fair Value Disclosure [Abstract] Assets, Fair Value Disclosure [Abstract] Cash and Cash Equivalents Cash and Cash Equivalents, Fair Value Disclosure Other Temporary Investments Risk Management Assets Derivative Asset [Abstract] Risk Management Assets Derivative Asset Spent Nuclear Fuel and Decommissioning Trusts Nuclear Fuel and Decommissioning Trusts [Abstract] Nuclear Fuel and Decommissioning Trusts Abstract. Spent Nuclear Fuel and Decommissioning Trusts Total Assets Assets, Fair Value Disclosure Liabilities, Fair Value Disclosure [Abstract] Liabilities, Fair Value Disclosure [Abstract] Risk Management Liabilities Derivative Liability Changes in the Fair Value of Net Trading Derivatives and other investments Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Beginning Balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Realized Gain (Loss) Included in Net Income (or Changes in Net Assets) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Unrealized Gain (Loss) Included in Net Income (or Changes in Net Assets) Relating to Assets Still Held at the Reporting Date Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Realized and Unrealized Gains (Losses) Included in Other Comprehensive Income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Purchases, Issuances and Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) Transfers into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Changes in Fair Value Allocated to Regulated Jurisdictions Changes in Fair Value Allocated to Regulated Jurisdiction This element represents total gains or losses for the period (realized and unrealized), arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are allocated to regulated jurisdictions. Ending Balance Level 3 Quantitative Information [Abstract] Fair Value Inputs, Quantitative Information [Abstract] Forward Price Range Low Low Market Price Low market price for unobservable inputs. Forward Price Range High High Market Price High market price for unobservable inputs. Counterparty Credit Risk Fair Value Inputs, Counterparty Credit Risk Weighted Average Market Price Weighted Average Market Price Weighted average market price for unobservable inputs. Fair Value Measurements 1 (Textuals) [Abstract] Fair Value Measurements 1 (Textuals) [Abstract] Fair value measurements textuals abstract for assets and liabilities measured on a recurring basis. Maturity of Net Fair Value of Risk Management Contracts Prior to Cash Collateral, Assets/Liabilities Maturity Of Net Fair Value Of Risk Management Contracts Prior To Cash Collateral Assets Or Liabilities Maturity of the net fair value of risk management contracts prior to cash collateral, assets or liabilities. Variable Interest Entities [Abstract] Great Plains Energy Inc. [Member] Great Plains Energy Inc. [Member] Great Plains Energy Inc. [Member] Transource Energy [Member] Transource Energy [Member] Transource Energy [Member] AEP Generating Co [Member] AEP Generating Co [Member] AEP Generating Company Ohio Valley Electric Corporation [Member] Ohio Valley Electric Corporation [Member] Ohio Valley Electric Corporation Cleco Power, LLC [Member] Cleco Power, LLC [Member] Cleco Power LLC Member First Energy Corp [Member] First Energy Corp [Member] First Energy Corporation Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Current Assets [Member] Current Assets [Member] Current Assets Net Property Plant And Equipment [Member] Net Property Plant And Equipment [Member] Net Property Plant And Equipment Other Non Current Assets [Member] Other Noncurrent Assets [Member] Total Assets [Member] Total Assets [Member] Total Assets Current Liabilities [Member] Current Liabilities [Member] Current Liabilities Noncurrent Liabilities [Member] Noncurrent Liabilities [Member] Noncurrent Liabilities Equity [Member] Equity [Member] Total Liabilities And Equity [Member] Total Liabilities And Equity [Member] Total Liabilities And Equity Statement, Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Capital Contribution From Parent [Member] Capital Contribution From Parent [Member] Capital Contribution From Parent Retained Earnings [Member] Retained Earnings [Member] SWEPCo's Guarantee Of Debt [Member] SWEPCo's Guarantee Of Debt [Member] Swepcos Guarantee Of Debt Total Investment [Member] Total Investment [Member] Total Investment Variable Interest Entities by Classification of Entity [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Sabine Mining Co [Member] Sabine Mining Co [Member] Sabine Mining Company Variable Interest Entity Member DCC Fuel [Member] DCC Fuel [Member] DCC Fuel Variable Interest Entity Member AEP Credit, Inc. [Member] AEP Credit, Inc. [Member] AEP Credit, Inc. Variable Interest Entity Member AEP Texas Central Transition Funding Co [Member] AEP Texas Central Transition Funding Co [Member] AEP Texas Central Transition Funding Company Variable Interest Entity Member Appalachian Consumer Rate Relief Funding [Member] Appalachian Consumer Rate Relief Funding [Member] Appalachian Consumer Rate Relief Funding [Member] Protected Cell Of Energy Insurance Services, Inc. [Member] Protected Cell Of Energy Insurance Services, Inc. [Member] Protected Cell Of Energy Insurance Services, Inc. Variable Interest Entity Member Dolet Hills Lignite Co, LLC [Member] Dolet Hills Lignite Co, LLC [Member] Dolet Hills Lignite Co, LLC Variable Interest Entity Member PATH West Virginia Transmission Co, LLC [Member] PATH West Virginia Transmission Co, LLC [Member] PATH West Virginia Transmission Co, LLC Variable Interest Entity Member Allegheny Series [Member] Allegheny Series [Member] Portion of the Potomac-Appalachian Transmission Highline, LLC (PATH) joint venture which is 100% owned by a subsidiary of FirstEnergy. Billings from AEP Generating Co [Member] Billings from AEP Generating Co [Member] Billings from American Electric Power Service Corporation [Member] Billings from American Electric Power Service Corporation [Member] Carrying Amount in AEPSC's Accounts Payable [Member] Carrying Amount in AEPSC's Accounts Payable [Member] Carrying Amount in AEPSC's accounts payable. Carrying Amount in AEGCo's Accounts Payable [Member] Carrying Amount in AEGCo's Accounts Payable [Member] Carrying Amount in AEGCo's accounts payable. Ohio Phase-In-Recovery Funding [Member] Ohio Phase-In-Recovery Funding [Member] Ohio Phase-In-Recovery Funding Variable Interest Entity Member Jointly Owned Utility Plant [Axis] Jointly Owned Utility Plant [Axis] Jointly Owned Utility Plant Domain Jointly Owned Utility Plant [Domain] Rockport Generating Plant (Unit No. 1) [Member] Rockport Generating Plant (Unit No. 1) [Member] Rockport Generating Plant (Unit No. 2) [Member] Rockport Generating Plant (Unit No. 2) [Member] Lawrenceburg Generating Station [Member] Lawrenceburg Generating Station [Member] Consolidated Assets and Liabilities of Variable Interest Entities Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract] ASSETS Variable Interest Carrying Amount Assets [Abstract] Variable Interest Carrying Amount Assets. Assets Variable Interest Entity, Consolidated, Carrying Amount, Assets LIABILITIES AND EQUITY Variable Interest Carrying Amount Liabilities And Equity [Abstract] Variable Interest Carrying Amount Liabilities And Equity. Liabilities and Equity Variable Interest Carrying Amount Liabilities and Equity Variable Interest carrying amount liabilities and equity. Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract] As Reported on the Consolidated Balance Sheet Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Maximum Exposure Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Billings from Affiliates Billings from Affiliates [Abstract] Billings from VIE Billings From VIE Billings from VIE. Variable Interest Entities (Textuals) [Abstract] Variable Interest Entities (Textuals) [Abstract] Insurance Premium Expense to Protected Cell Insurance premium expense to protected cell Insurance premium expense to protected cell. Minimum Percentage of Equity AEP Provides Minimum Percentage of Equity AEP Provides The minimum percentage of equity AEP Parent provides to AEP Credit. Percentage of Short Term Borrowing Needs in Excess of Third Party Financings Percentage Of Short Term Borrowing Needs In Excess Of Third Party Financings Percentage of short-term borrowing needs in excess of third party financings provided by AEP to AEP Credit. Percentage of VIE Sales of Lignite Produced Percentage Of VIE Sales Of Lignite Produced Percentage of VIE sales of lignite produced. Percentage of DHLCs Debt Guaranteed by Each SWEPCo and CLECO Percentage Of VIE Debt Guaranteed Percentage of DHLCs debt guaranteed by each SWEPCo and CLECO. Percentage of Management Fee Received by SWEPCo from DHLC Percentage Of VIE Management Fee Received Percentage of management fee received by SWEPCo from DHLC. Securitization Bonds Secured Debt Securitized Transition Assets Securitized Regulatory Transition Assets, Noncurrent Payments Made by I&M to DCC Fuel Capital lease Payments made Capital lease payments made by I&M to DCC Fuel. Percentage Ownership of "Allegheny Series" by a Nonaffiliated Company Percentage of Ownership in subsidiary Percentage of ownership in Allegheny Series by a nonaffiliated company. Intercompany Item Eliminated in Consolidation Unearned Revenue Carrying amount as of the balance sheet date of unearned revenue that will be recognized over a future period of time consistent with the repayment of Transition Funding III's bond principal balance. Jointly Owned Utility Plant, Proportionate Ownership Share Jointly Owned Utility Plant, Proportionate Ownership Share Percentage Interest in Rockport Plant Unit 2 Lease Percentage Interest in Lease AEGCo's percentage interest in Rockport Plant unit 2 lease. Equity and Voting Ownership Percentage Equity and Voting Ownership Percentage Equity And Voting Ownership Percentage Variable Interest Entities [Axis] Variable Interest Entity [Axis] Variable Interest Entity [Axis] Variable Interest Entity. Variable Interest Entity, Billings and Carrying Amounts [Domain] Variable Interest Entity, Billings and Carrying Amounts [Domain] Variable Interest Entity billings and carrying amount in accounts payable. Consolidated Assets and Liabilities of Variable Interest Entities Consolidated Assets And Liabilities Of Variable Interest Entities [Table Text Block] Schedule of consolidated assets and liabilities of variable interest entities. Companys Investment In Joint Venture Companys Investment In Joint Venture [Text Block] Companys investment in joint venture. Billings from Significant Variable Interest Billings from Significant Variable Interest [Text Block] Billings from significant variable interest entity. Carrying Amount and Classification of Variable Interest in Accounts Payable Carrying Amount and Classification of Variable Interest in Accounts Payable [Text Block] The carrying amount and classification of variable interest in accounts payable. Derivatives and Hedging Derivative Instruments and Hedging Activities Disclosure [Text Block] Statement of Comprehensive Income [Abstract] OTHER COMPREHENSIVE INCOME Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Cash Flow Hedges, Net of Tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Securities Available for Sale, Net of Tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Amortization of Pension and OPEB Deferred Costs, Net of Tax Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax TOTAL OTHER COMPREHENSIVE INCOME (LOSS) Other Comprehensive Income (Loss), Net of Tax TOTAL COMPREHENSIVE INCOME (LOSS) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Total Comprehensive Income Attributable to Noncontrolling Interest Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest TOTAL COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO COMMON SHAREHOLDERS Comprehensive Income (Loss), Net of Tax, Attributable to Parent Changes in Accumulated Other Comprehensive Income by Component Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Reclassifications from Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Debt Disclosure [Abstract] Financing Activities Debt Disclosure [Text Block] Income Tax Policy Income Tax, Policy [Policy Text Block] Long-term Debt Schedule of Debt [Table Text Block] Long-term Debt Issuances Long Term Debt and Other Securities Issued [Text Block] This element may be used as a single block of text to encapsulate long-term debt and other securities issued during the period. Retirements and Principal Payments Schedule of Extinguishment of Debt [Table Text Block] Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits Utility Money Pool Participants Money Pool Activity And Authorized Borrowing Limits [Text Block] Tabular disclosure of a Utility Money Pool participants' money pool activity and authorized borrowing limits including: (1) Maximum Borrowings from Utility Money Pool; (2) Maximum Loans to Utility Money Pool; (3) Average Borrowings from Utility Money Pool; (4) Average Loans to Utility Money Pool; (5) Net Loans (Borrowings) to/from Utility Money Pool as of the balance sheet date; (6) Authorized Short-term Borrowing Limit. The Utility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain utility subsidiaries. Nonutility Money Pool Activity Nonutility Money Pool Activity [Text Block] Tabular disclosure of a Nonutility Money Pool participants' money pool activity and authorized borrowing limits including: (1) Maximum Borrowings from Nonutility Money Pool; (2) Maximum Loans to Nonutility Money Pool; (3) Average Borrowings from Nonutility Money Pool; (4) Average Loans to Nonutility Money Pool; (5) Net Loans (Borrowings) to/from Nonutility Money Pool as of the balance sheet date; (6) Authorized Short-term Borrowing Limit.The Nonutility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain nonutility subsidiaries. Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool Maximum And Minimum Interest Rates For Funds Either Borrowed From Or Loaned To Utility Money Pool [Text Block] Tabular disclosure of the maximum and minimum weighted-average interest rate, calculated on a daily basis, of funds either borrowed from or loaned to a Utility Money Pool during the period. The Utility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain utility subsidiaries. Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool Average Interest Rates For Funds Borrowed From And Loaned To Utility Money Pool [Text Block] Tabular disclosure of the average interest rates for funds borrowed from and loaned to a Utility Money Pool. The Utility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain utility subsidiaries. Maximum, Minimum and Average Interest Rates for Funds Borrowed from and Loaned to the Nonutility Money Pool Maximum Minimum Average Interest Rates for Funds Borrowed from Loaned to Nonutility Money Pool [Text Block] Tabular disclosure of the maximum and minimum weighted-average interest rate, calculated on a daily basis and the average interest rates of funds borrowed from or loaned to a Nonutility Money Pool during the period.The Nonutility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain nonutility subsidiaries. Interest Expense Incurred by Registrant Subsidiaries' for amounts borrowed from the Utility Money Pool Interest Expense Incurred [Text Block] Interest Expense Incurred. Interest Income Earned by Registrant Subsidiaries' for Amounts Advanced to Utility Money Pool Interest Income Earned [Text Block] Interest Income Earned. Short Term Debt Schedule of Short-term Debt [Table Text Block] Comparative Accounts Receivable Information Comparative Accounts Receivable Information [Text block] Comparative accounts receivable information. Customer Accounts Receivable Managed Portfolio Customer Accounts Receivable Managed Portfolio [Text Block] Customer accounts receivable managed portfolio. Accounts Receivable and Accrued Unbilled Revenues Accounts Receivable and Accrued Unbilled Revenues [Text Block] Accounts receivable and accrued unbilled revenues under the sale of receivables agreement. Fees Paid to AEP Credit for Customer Accounts Receivable Sold Fees Paid to AEP Credit for Customer Accounts Receivable Sold [Text Block] Fees paid to AEP Credit for customer accounts receivable sold. Proceeds on Sale of Receivables to AEP Credit Proceeds on Sale of Receivables to AEP Credit [Text Block] Proceeds on sale of receivables to AEP Credit. Reconciliations of accumulated provision for uncollectable accounts Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Book Values and Fair Values of Long-term Debt Fair Value, by Balance Sheet Grouping [Table Text Block] Other Temporary Investments Other Temporary Investments [Text Block] Other Temporary Investments Debt and Equity Securities Within Other Temporary Investments Debt and Equity Securities Within Other Temporary Investments [Text Block] Debt and equity securities within Other Temporary Investments. Nuclear Trust Fund Investments Nuclear Trust Fund Investments [Text Block] Nuclear trust fund investments. Securities Activity Within the Decommissioning and SNF Trusts Securities Activity Within Decommissioning and SNF Trusts [Text Block] Securities Activity Within the decommissioning and SNF trusts. Contractual Maturities, Fair Value of Debt Securities in Nuclear Trusts Investments Classified by Contractual Maturity Date [Table Text Block] Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Changes in Fair Value of Net Trading Derivatives and Other Investments Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Significant Unobservable Inputs for Level 3 Fair Value Inputs Assets Liabilities Quantitative Information [Table Text Block] Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets and liabilities. This disclosure may include, but is not limited to, the fair value of the asset or liability, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. Sensitivity of Fair Value Measurements Fair Value, Option, Qualitative Disclosures Related to Election [Table Text Block] Discontinued Operations and Disposal Groups [Abstract] Results of operations of discontinued operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Vertically Integrated Utilities Revenues [Member] Vertically Integrated Utilities Revenues [Member] Vertically Integrated Utilities Revenues. Generation & Marketing Revenues [Member] Generation & Marketing Revenues [Member] Generation & Marketing Revenues. Electric Generation, Transmission and Distribution Revenues [Member] Electric Generation Transmission Distribution Revenues [Member] Electric Generation, Transmission and Distribution Revenues. Sales to AEP Affiliates [Member] Sales to AEP Affiliates [Member] Sales to AEP affiliates. Other Revenues [Member] Regulatory Assets [Member] Regulatory Assets [Member] Regulatory Assets. Regulatory Liabilities [Member] Regulatory Liabilities [Member] Regulatory Liabilities. Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Commodity [Member] Commodity Contract [Member] Interest Rate and Foreign Currency [Member] Interest Rate and Foreign Currency [Member] Interest Rate and Foreign Currency Member. Gross Amounts of Risk Management Assets/Liabilities Recognized [Member] Gross Amounts of Risk Management Assets Liabilities Recognized [Member] Gross Amounts of Risk Management Assets/Liabilities Recognized. Gross Amounts Offset in the Statement of Financial Position [Member] Gross Amounts Offset in Statement of Financial Position [Member] Gross Amounts Offset in the Statement of Financial Position. Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position [Member] Net Amounts of Assets Liabilities Presented in Statement of Financial Position [Member] Net Amounts of Assets/Liabilities Presented in the Statement of Financial Position. Power [Member] Power Contract Member [Member] Nominal energy measure used to calculate payments on a derivative instrument. Coal [Member] Coal Contract [Member] Natural Gas [Member] Natural Gas Contract Member [Member] Nominal energy measure used to calculate payments on a derivative instrument. Heating Oil and Gasoline [Member] Heating Oil And Gasoline Contract Member [Member] Nominal volume used to calculate payments on a derivative instrument. Interest Rate Contract [Member] Interest Rate Contract [Member] Risk Management Contracts [Member] Hedging Contracts [Member] Hedging Contracts [Member] Notional Volume Of Derivative Instruments Notional Volume Of Derivative Instruments [Abstract] Notional Volume Of Derivative Instruments Abstract. Commodity: Commodity [Abstract] Commodity. Derivative, Energy Notional Amount Derivative Nonmonetary Energy Notional Amount Volume of energy derivative contracts. Derivative, Mass Notional Amount Derivative Nonmonetary Mass Notional Amount Volume of coal derivative contracts. Derivative, Volume Notional Amount Derivative Nonmonetary Volume Notional Amount Volume of heating oil and gasoline derivative contracts. Derivative, Notional Amount Derivative, Notional Amount Cash Collateral Netting Cash Collateral Netting [Abstract] Cash collateral netting detail. Cash Collateral Received Netted Against Risk Management Assets Securities Received as Collateral Cash Collateral Paid Netted Against Risk Management Liabilities Obligation to Return Securities Received as Collateral Fair Value of Derivative Instruments Derivative Instrument Detail [Abstract] Current Risk Management Assets Derivative Asset, Current Long-term Risk Management Assets Derivative Asset, Noncurrent Total Assets Current Risk Management Liabilities Derivative Liability, Current Long-term Risk Management Liabilities Derivative Liability, Noncurrent Total Liabilities Total MTM Derivative Contract Net Assets (Liabilities) Derivative Assets (Liabilities), at Fair Value, Net Amount of Gain (Loss) Recognized on Risk Management Contracts Gain (Loss) on Derivative Instruments, Net, Pretax [Abstract] Amount of Gain (Loss) Recognized on Risk Management Contracts Gain (Loss) on Derivative Instruments, Net, Pretax Amount of Gain (Loss) Recognized on Risk Management Contracts Derivative Risk Management Contracts Gain Loss Recognized As Regulatory Asset Liability Realized and unrealized gains and losses subject to regulatory accounting treatment recorded as either current or noncurrent on the balance sheets. Impact of Cash Flow Hedges on the Condensed Balance Sheet Impact of Cash Flow Hedges on Balance Sheet [Abstract] Impact of Cash Flow Hedges on Balance Sheet. Hedging Assets Hedging Assets Impact of cash flow hedges on balance sheet hedging assets. Hedging Liabilities Hedging Liabilities Impact of cash flow hedges on balance sheet hedging liabilities. AOCI Gain (Loss) Net of Tax Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax Portion Expected to be Reclassified to Net Income During the Next Twelve Months Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months Maximum Term for Exposure to Variability of Future Cash Flows Maximum Length of Time Hedged in Price Risk Cash Flow Hedge Collateral Triggering Events [Abstract] Collateral Triggering Events [Abstract] Collateral Triggering Events Abstract. Liabilities for Derivative Contracts with Credit Downgrade Triggers Derivative, Net Liability Position, Aggregate Fair Value Amount of Collateral AEP Subsidiaries Would Have Been Required to Post Additional Collateral, Aggregate Fair Value Amount Attributable to RTO and ISO Activities Amount Attributable To RTO and ISO Activities Aggregate fair value of derivative contracts that would be required to be posted if credit rating had dropped below investment grade that are attributable to Regional Transmission Organizations and Independant System Operators. Liabilities for Contracts with Cross Default Provisions Prior to Contractual Netting Arrangements Fair Value Of Derivative Liabilities Subject To Cross Default Provisions Fair value of derivative liabilities subject to cross-default provisions. Amount of Cash Collateral Posted Collateral Already Posted, Aggregate Fair Value Additional Settlement Liability if Cross Default Provision is Triggered Assets Needed for Immediate Settlement, Aggregate Fair Value Derivatives and Hedging (Textuals) [Abstract] Derivatives and Hedging Textuals [Abstract] Derivatives and Hedging Textuals Gain (Loss) on Fair Value Hedging Instrument Derivative, Gain (Loss) on Derivative, Net Gain (Loss) on Fair Value Portion of Long Term Debt Gain (Loss) on Fair Value Portion of Long Term Debt Gain (Loss) on fair value portion of long-term debt. Cross Default Provisions Maximum Third Party Obligation Amount Cross Default Provisions Maximum Third Party Obligation Amount Non-exchange traded commodity contracts containing cross-default provisions Accounting Policies [Abstract] Significant Accounting Matters Significant Accounting Policies [Text Block] Components of Accumulated Other Comprehensive Income (Loss)(AOCI) Components of Accumulated Other Comprehensive Income Loss [Text Block] Components of Accumulated Other Comprehensive Income (Loss)(AOCI). Basic and Diluted EPS Calculations Earnings Per Share [Text Block] Net increase (decrease) in depreciation expense Net Increase Decrease in Depreciation Expense [Text Block] Net increase (decrease) in depreciation expense. Supplementary Information Supplementary Information [Text Block] Supplementary Information. Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Pension Plans [Member] Pension Plan, Defined Benefit [Member] Other Postretirement Benefit Plans [Member] Other Postretirement Benefit Plan, Defined Benefit [Member] Components of Net Periodic Benefit Cost Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] Service Cost Defined Benefit Plan, Service Cost Interest Cost Defined Benefit Plan, Interest Cost Expected Return on Plan Assets Defined Benefit Plan, Expected Return on Plan Assets Amortization of Prior Service Cost (Credit) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Amortization of Net Actuarial Loss Defined Benefit Plan, Amortization of Gains (Losses) Net Periodic Benefit Cost (Credit) Defined Benefit Plan, Net Periodic Benefit Cost Line of Credit Facility [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Facility 1 [Member] Facility 1 [Member] Facility 1 letter of credit member. Facility 2 [Member] Facility 2 [Member] Facility 2 letter of credit member. Replacement Facility Maturing 2016 [Member] Replacement Facility Maturing 2016 [Member] Replacement facility maturing 2016 member. Letter of Credit [Member] Letter of Credit [Member] Mining Area [Axis] Mining Area [Axis] Mining area. Mining Area [Domain] Mining Area [Domain] Mining area. Original [Member] Original [Member] Original area of mine subject to reclamation. Expanded [Member] Expanded [Member] Area of the mine, as expanded, subject to reclamation. Penalty [Axis] Penalty [Axis] Penalty Axis. Penalty [Domain] Penalty [Domain] Penalty Domain. Civil Penalties [Member] Civil Penalties [Member] Civil Penalties Member. Loss Contingencies by Nature of Contingency [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Superfund and State Remediation [Member] Superfund and State Remediation [Member] Superfund and State Remediation Member. Amos Plant [Member] Amos Plant [Member] Amos Plant Member. Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Credit Agreement Three [Member] Credit Agreement Three [Member] Credit Agreement Three Member. Credit Agreement Two [member] Credit Agreement Two [member] Credit Agreement Two member. Credit Agreement One [member] Credit Agreement One [member] Credit Agreement One member. OPCo/ Buckeye Power, Inc. [Member] OPCo/ Buckeye Power, Inc. [Member] OPCo/ Buckeye Power, Inc. CSPCo/Dayton Power and Light Company/Duke Energy Ohio, Inc. [Member] CSPCo/Dayton Power and Light Company/Duke Energy Ohio, Inc. [Member] CSPCo/Dayton Power and Light Company/Duke Energy Ohio, Inc. Indiana-Kentucky Electric Corporation [Member] Indiana-Kentucky Electric Corporation [Member] Indiana-Kentucky Electric Corporation Plant Name [Axis] Plant Name [Axis] Plant Name. Plant Name [Domain] Plant Name [Domain] Plant Name. Cardinal [Member] Cardinal [Member] Cardinal. Conesville [Member] Conesville [Member] Conesville. Clifty Creek [Member] Clifty Creek [Member] Clifty Creek. Kyger Creek [Member] Kyger Creek [Member] Kyger Creek. Muskingum River [Member] Muskingum River [Member] Muskingum River. Big Sandy [Member] Big Sandy [Member] Big Sandy. Products and Services [Axis] Products and Services [Axis] Product and Service, Name [Domain] Products and Services [Domain] Fuel Purchase Contracts [Member] Fuel Purchase Contracts [Member] Fuel Purchase Contracts. Energy and Capacity Purchase Contracts [Member] Energy and Capacity Purchase Contracts [Member] Energy and Capacity Purchase Contracts. Construction Contracts for Capital Assets [Member] Construction Contracts for Capital Assets [Member] Construction Contracts for Capital Assets. Guarantor Obligations by Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Letters of Credit [Member] Letters of Credit [Member] Letters of Credit Member. Master Lease Agreements [Member] Master Lease Agreements [Member] Master Lease Agreements Member. Guarantees of Third Party Obligations [Member] Guarantees of Third Party Obligations [Member] Guarantees of Third Party Obligations Member. Contractual Commitments Recorded Unconditional Purchase Obligation, Fiscal Year Maturity Schedule [Abstract] Less than 1 year Recorded Unconditional Purchase Obligation Due in Next Twelve Months For 2-3 years Recorded Unconditional Purchase Obligation Due Within Two To Three Year Recorded Unconditional Purchase Obligation Due Within Two To Three Year. For 4-5 years Recorded Unconditional Purchase Obligation Due Within Four To Five Year Recorded Unconditional Purchase Obligation Due Within Four To Five Year. After 5 years Recorded Unconditional Purchase Obligation Due after Fifth Year Total Recorded Unconditional Purchase Obligation Maximum Future Payments for Letters of Credit [Abstract] Maximum Future Payments for Letters of Credit [Abstract] Maximum Future Payments for Letters of Credit Maximum Future Payments for Letters of Credit Maximum future payments for Letters of Credit issued under the two credit facilities. Pollution Control Bonds Supported by Bilateral Letters of Credit [Abstract] Pollution Control Bonds Supported by Bilateral Letters of Credit [Abstract] Variable Rate PCBs Supported Variable Rate PCBs Supported Amount of Pollution Control Bonds supported by bilateral letters of credit. Bilateral Letters of Credit Letters of Credit Outstanding, Amount Maximum Potential Loss on Master Lease Agreements [Abstract] Maximum Potential Loss on Master Lease Agreements [Abstract] Max Potential Loss on Master Lease Agreements Max Potential Loss on Master Lease Agreements Maximum potential loss on master lease agreements. Commitments, Guarantees and Contingencies (Textuals) [Abstract] Commitments Guarantees And Contingencies Textuals [Abstract] Commitments, Guarantees and Contingencies. Revolving Credit Facilities Credit Facilities Structured Amount of revolving credit facilities. Letters of Credit Limit Line of Credit Facility, Maximum Borrowing Capacity Maximum Future Payments for Letters of Credit Uncommitted Facility Uncommitted Facility Amount of letters of credit drawn on an uncommitted credit facility. Maximum Future Payments for Letters of Credit Issued Under the Uncommitted Facility Maximum Future Payments for Letters of Credit Issued Under the Uncommitted Facility Maximum future payments for Letters of Credit issued under the uncommitted facility. Interim Credit Facility Interim Credit Facility Interim credit facility. Guarantees of Mine Reclamation, Amount Guarantees Of Mine Reclamation Amount Guarantees of mine reclamation, amount. Estimated Final Cost Mine Reclamation Estimated Final Cost Mine Reclamation Estimated final cost mine reclamation. Total Amount Collected through a Rider for Final Mine Closure and Reclamation Costs Amount Collected Through Rider For Final Mine Closure And Reclamation Costs Total amount collected through a rider for final mine closure and reclamation costs. Amount Collected through a Rider for Final Mine Closure - Other Current Liabilities Amount Collected, Rider Mine Close Other Current Liabilities Amount collected through a rider for final mine closure and reclamation costs recorded in other current liabilities Amount Collected through a Rider for Final Mine Closure - Other Liabilities Noncurrent Amount Collected Rider Mine Close Other Liabilities Noncurrent Amount collected through a rider for final mine closure and reclamation costs recorded in deferred credits and other noncurrent liabilities Amount Collected through a Rider for Final Mine Closure - ARO Noncurrent Amount Collected, Rider Mine Close ARO Noncurrent Amount collected through a rider for final mine closure and reclamation costs recorded in asset retirement obligations Maximum Exposure Related to the Collective Purchase Price Guarantor Obligations, Maximum Exposure, Undiscounted Maximum Exposure Related to Bank of America Litigation Loss Contingency, Range of Possible Loss, Maximum Deferred Gain and Accrued Litigation Costs Estimated Litigation Liability Max Term of New Master Lease Agreements Max term master lease agreements Max term of new master lease agreements Max Potential Loss on Master Lease Agreements Initial Railcar Lease Term Initial Railcar Lease Term Initial railcar lease term. Maximum Railcar Lease Obligation Term Max railcar lease obligation term Maximum railcar lease obligation term. Future Minimum Lease Obligation for Remaining Railcars Operating Leases, Future Minimum Payments Due Guaranteed Sales Proceeds Percentage of Fair Value to Lessor Current Term Sale Proceeds Guaranteed by Lessor Under Current Five Year Lease Term Sale proceeds guaranteed by lessor under current five year lease term. Guaranteed Sales Proceeds Percentage of Fair Value to Lessor End of Max Lease Term Sale Proceeds Guaranteed by Lessor at End of Twenty Year Term Sale proceeds guaranteed by lessor at the end of 20-year term. Maximum Potential Loss on Guarantee of Return-and-Sale Option Maximum Potential Loss Related to Guarantee Maximum potential loss related to the guarantee. Coal Fired Power Plants Coal Fired Power Plants Coal fired power plants. Paid administrative penalty Paid administrative penalty Paid administrative penalty. Expense Recorded Due to Remediation Work Remaining Provision Environmental Remediation Expense Purchases Coverage for Property Damage for a Nonnuclear Incident Purchases Coverage For Property Damage Nonnuclear Incident Purchases coverage for property damage for a nonnuclear incident.. Proposed Civil Penalty for Violation of Federal Reporting Requirements civil penalty Proposed civil penalty for Amos Plant show cause request Proposed State Civil Penalty for Violation of Reporting Requirements State Civil Penalty Proposed state penalty for Amos plant Amount Paid to Settle State Environmental Claim Payment For State Civil Penalty Amount paid to settle state action Reconciliation of Beginning and Ending Unrecognized Tax Benefits Summary of Income Tax Contingencies [Table Text Block] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassifications from Accumulated Other Comprehensive Income [Member] Reclassification out of Accumulated Other Comprehensive Income [Member] Equity Components [Axis] Cash Flow Hedges [Member] Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] Securities Available for Sale [Member] Accumulated Net Unrealized Investment Gain (Loss) [Member] Pension and OPEB [Member] Accumulated Defined Benefit Plans Adjustment [Member] Changes in Accumulated Other Comprehensive Income (Loss) by Component Changes In Accumulated Other Comprehensive Income by Component [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] Beginning Balance in AOCI Accumulated Other Comprehensive Income (Loss), Net of Tax Change in Fair Value Recognized in AOCI Other Comprehensive Income Unrealized Gain Loss Arising During Period Net Of Tax Net of tax amount, before reclassification adjustments, of the change in accumulated gain (loss). Amounts Reclassified from AOCI Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Net Current Period Other Comprehensive Income Ending Balance in AOCI Reclassifications From Accumulated Other Comprehensive Income (Loss) Reclassifications From Accumulated Other Comprehensive Income [Abstract] Gains and Losses on Cash Flow Hedges Gains And Losses On Cash Flow Hedges [Abstract] Vertically Integrated Utilities Electric Revenue Generation & Marketing Revenues Other Revenue, Net Purchased Electricity for Resale Cost of Purchased Power Other Operation Expense Utilities Operating Expense, Operations Maintenance Expense Utilities Operating Expense, Maintenance Property, Plant and Equipment Reclassifications into Property Plant and Equipment Before tax effect of the reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was reclassed to assets / liabilities during the period. Regulatory Assets/(Liabilities), Net Reclassifications into Regulatory Assets or Liabilities, Net Before tax effect of the reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was reclassed to assets / liabilities during the period. Subtotal - Commodity Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Interest Rate and Foreign Currency: Interest Rate And Foreign Currency [Abstract] Depreciation and Amortization Expense Interest Expense Interest Expense Subtotal - Interest Rate and Foreign Currency Reclassifications from AOCI, before Income Tax (Expense) Credit Income Tax (Expense) Credit Income Tax Expense (Benefit) Reclassifications from AOCI, Net of Income Tax (Expense) Credit Gains and Losses on Available-for-Sale Securities Gains and Losses on Availableforsale Securities [Abstract] Interest Income Investment Income, Net Amortization of Pension and OPEB Amortization Of Pension And Other Postretirement Benefit Plans [Abstract] Prior Service Cost (Credit) Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax Actuarial (Gains)/Losses Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax Acquisitions, Dispositions and Impairments Property, Plant and Equipment, Schedule of Significant Acquisitions and Disposals [Table Text Block] Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] Components of Net Periodic Benefit Cost Schedule of Net Benefit Costs [Table Text Block] Statement of Stockholders' Equity [Abstract] Parent [Member] Parent [Member] Common Stock [Member] Common Stock [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Income (Loss) [Member] Noncontrolling Interests [Member] Noncontrolling Interest [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Beginning Balance, Shares Common Stock, Shares, Issued Issuance of Common Stock, Value Stock Issued During Period, Value, New Issues Issuance of Common Stock, Shares Stock Issued During Period, Shares, New Issues Distribution of Cook Coal Terminal to Parent Distributions To Parent Distribution of Cook Coal Terminal (w/cash) to AEGCo. Capital Contribution from Parent Proceeds from Contributions from Parent Common Stock Dividends Affiliated Dividends Common Stock Equity impact of aggregate cash, stock, and paid-in-kind dividends declared to an entity that is affiliated with the reporting entity by means of direct or indirect ownership. Common Stock Dividends Dividends, Common Stock Common Stock Dividends Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Gain on Reacquired Preferred Stock Preferred Stock Redemption Discount Capital Stock Expense Amortization of Other Deferred Charges Noncash Dividend of Property to Parent Dividends, Common Stock, Paid-in-kind Other Changes in Equity Stockholders' Equity, Other Subtotal - Equity Subtotal Common Shareholders Equity Subtotal - Common Shareholders' Equity. Net Income (Loss) Net Income (Loss) Attributable to Parent Net Income (Loss) Attributable to Noncontrolling Interests Net Income (Loss) Attributable to Noncontrolling Interest Other Comprehensive Income (Loss) Ending Balance Ending Balance, Shares Statement of Financial Position [Abstract] AEP Subsidiaries [Member] Subsidiaries [Member] Current Assets Assets, Current [Abstract] Cash and Cash Equivalents Fuel Inventory, Raw Materials, Gross Property, Plant and Equipment Property, Plant and Equipment, Gross [Abstract] Other Property, Plant and Equipment Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment Accumulated Depreciation and Amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Current Liabilities Liabilities, Current [Abstract] Long-term Debt Due Within One Year Long-term Debt, Current Maturities Noncurrent Liabilities Liabilities, Noncurrent [Abstract] Long-term Debt Long-term Debt, Excluding Current Maturities Equity Stockholders' Equity Attributable to Parent [Abstract] Common Stock, No Par Value Common Stock, No Par Value Common Stock, Par Value Per Share Common Stock, Par or Stated Value Per Share Common Stock, Shares Authorized Common Stock, Shares Authorized Common Stock, Shares, Issued Common Stock, Shares Outstanding Common Stock, Shares, Outstanding Treasury Stock, Shares Treasury Stock, Shares AEP Texas Central Co [Member] AEP Texas Central Co [Member] AEP Texas Central Company Member AEP Texas North Co [Member] AEP Texas North Co [Member] AEP Texas North Company Member Electric Transmission Texas, LLC [Member] Electric Transmission Texas, LLC [Member] Electric Transmission Texas, LLC Member AEP Transmission Company, LLC [Member] Aep Transmission Company [Member] Another company which is controlled, directly or indirectly, by its parent. The usual condition for control is ownership of a majority (over 50%) of the outstanding voting stock. The power to control may also exist with a lesser percentage of ownership, for example, by contract, lease, agreement with other stockholders or by court decree. Transource Missouri [Member] Transource Missouri [Member] Transource Missouri [Member] AEP Generation Resources [Member] AEP Generation Resources [Member] AEP Generation Resources [Member] Accelerated Share Repurchases, Date [Axis] Accelerated Share Repurchases, Date [Axis] Accelerated Share Repurchases, Date [Domain] Accelerated Share Repurchases, Date [Domain] Maturity Period Fourteen [Member] Maturity Period Fourteen [Member] Maturity Period Fourteen. Maturity Period Thirteen [Member] Maturity Period Thirteen [Member] Maturity Period Thirteen. Maturity Period Ten [Member] Maturity Period Ten [Member] Maturity Period Ten. Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Securitization Bonds One [Member] Secured Debt [Member] Securitization Bonds Two [Member] Securitization Bonds Two [Member] A collateralized debt obligation (backed by pledge, mortgage or other lien on the entity's assets). Securitization Bonds Three [Member] Securitization Bonds Three [Member] A collateralized debt obligation (backed by pledge, mortgage or other lien on the entity's assets). Securitization Bonds Four [Member] Securitization Bonds Four [Member] A collateralized debt obligation (backed by pledge, mortgage or other lien on the entity's assets). Securitization Bonds Five [Member] Securitization Bonds Five [Member] A collateralized debt obligation (backed by pledge, mortgage or other lien on the entity's assets). Notes Payable One [Member] Notes Payable, Other Payables [Member] Notes Payable Two [Member] Notes Payable, Other Payable Two [Member] A written promise to pay a note to a third party. Notes Payable Three [Member] Notes Payable, Other Payable Three [Member] A written promise to pay a note to a third party. Notes Payable Four [Member] Notes Payable, Other Payable Four [Member] A written promise to pay a note to a third party. Notes Payable Five [Member] Notes Payable, Other Payable Five [Member] A written promise to pay a note to a third party. Notes Payable Six [Member] Notes Payable, Other Payable Six [Member] A written promise to pay a note to a third party. Notes Payable Seven [Member] Notes Payable, Other Payable Seven [Member] A written promise to pay a note to a third party. Notes Payable Eight [Member] Notes Payable, Other Payable Eight [Member] A written promise to pay a note to a third party. Pollution Control Bonds One [Member] Pollution Control Bonds One [Member] Represents the debt securities issued by a state, certain agencies or authorities, a local government, or development corporation to finance the construction of air- or water-pollution control facilities or sewage or solid waste disposal facilities pursuant to federal law. The bonds are backed by the credit of the beneficiary of the financing rather than the credit of the issuer. New issues of these bonds are prohibited under the 1986 Tax Law. Pollution Control Bonds Two [Member] Pollution Control Bonds Two [Member] Represents the debt securities issued by a state, certain agencies or authorities, a local government, or development corporation to finance the construction of air- or water-pollution control facilities or sewage or solid waste disposal facilities pursuant to federal law. The bonds are backed by the credit of the beneficiary of the financing rather than the credit of the issuer. New issues of these bonds are prohibited under the 1986 Tax Law. Pollution Control Bonds Three [Member] Pollution Control Bonds Three [Member] Represents the debt securities issued by a state, certain agencies or authorities, a local government, or development corporation to finance the construction of air- or water-pollution control facilities or sewage or solid waste disposal facilities pursuant to federal law. The bonds are backed by the credit of the beneficiary of the financing rather than the credit of the issuer. New issues of these bonds are prohibited under the 1986 Tax Law. Pollution Control Bonds Four [Member] Pollution Control Bonds Four [Member] Represents the debt securities issued by a state, certain agencies or authorities, a local government, or development corporation to finance the construction of air- or water-pollution control facilities or sewage or solid waste disposal facilities pursuant to federal law. The bonds are backed by the credit of the beneficiary of the financing rather than the credit of the issuer. New issues of these bonds are prohibited under the 1986 Tax Law. Pollution Control Bonds Five [Member] Pollution Control Bonds Five [Member] Represents the debt securities issued by a state, certain agencies or authorities, a local government, or development corporation to finance the construction of air- or water-pollution control facilities or sewage or solid waste disposal facilities pursuant to federal law. The bonds are backed by the credit of the beneficiary of the financing rather than the credit of the issuer. New issues of these bonds are prohibited under the 1986 Tax Law. Senior Unsecured Notes One [Member] Senior Notes [Member] Senior Unsecured Notes Two [Member] Senior Unsecured Notes Two [Member] A senior note is a bond that takes priority over other debt securities sold by the issuer. In the event the issuer goes bankrupt, senior debt holders receive priority for [must receive] repayment [prior] relative to junior and unsecured (general) creditors. Senior Unsecured Notes Three [Member] Senior Unsecured Notes Three [Member] Potentially an asset sold under an agreement to repurchase, a senior note is a bond that takes priority over other debt securities sold by the issuer. In the event the issuer goes bankrupt, senior debt holders receive priority for [must receive] repayment [prior] relative to junior and unsecured (general) creditors. Senior Unsecured Notes Four [Member] Senior Unsecured Notes Four [Member] Long-term Debt [Member] Long-term Debt [Member] Long Term Debt Two [Member] Long Term Debt Two [Member] A debt arrangement having an initial term longer than one year or beyond the normal operating cycle, if longer. Long Term Debt Three [Member] Long Term Debt Three [Member] Land Note [Member] Land Note [Member] A debt arrangement for purchased land having an initial term longer than one year or beyond the normal operating cycle, if longer. Long-term Debt Long-term Debt, Unclassified [Abstract] Senior Unsecured Notes Unsecured Debt Pollution Control Bonds Long-term Pollution Control Bond Notes Payable Other Notes Payable Junior Subordinated Debentures Junior Subordinated Notes Spent Nuclear Fuel Obligation Spent Nuclear Fuel Obligation, Noncurrent Other Long-term Debt Other Long-term Debt Fair Value of Interest Rate Hedges Interest Rate Derivatives, at Fair Value, Net Unamortized Discount, Net Debt Instrument, Unamortized Discount (Premium), Net Total Long-term Debt Outstanding Long-term Debt and Other Securities Issued, Retired and Principal Payments Made Long term debt and other securities issued, retired and principal payments made [Abstract] Long-term debt and other securities issued, retired and principal payments made. Issuances Proceeds from Issuance of Debt Retirements and Principal Payments Interest Rate (Percentage) Debt Instrument, Interest Rate, Stated Percentage Interest Rate (Variable) Debt Instrument Interest Variable Rate The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. Due Date Debt Instrument, Maturity Date 1 Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.). Long- term Debt by Type of Debt and Maturity Long term Debt by Type of Debt and Maturity [Abstract] Long term Debt by Type of Debt and Maturity. Weighted Average Interest Rate Debt Instrument, Interest Rate, Effective Percentage Interest Rate (Minimum) Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum Interest Rate (Maximum) Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum Utility Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits Utility Money Pool Participants Money Pool Activity And Authorized Borrowing Limits [Abstract] Utility Money Pool Participants Money Pool Activity And Authorized Borrowing Limits Abstract. Maximum Borrowings from Utility Money Pool Maximum Borrowings from Utility Money Pool Maximum Borrowings from a Utility Money Pool at anytime during the period. The Utility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain utility subsidiaries. Maximum Loans to Utility Money Pool Maximum Loans to Utility Money Pool Maximum Loans to a Utility Money Pool at anytime during the period. The Utility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain utility subsidiaries. Average Borrowings from Utility Money Pool Average Borrowings from Utility Money Pool Average Borrowings from a Utility Money Pool during the period. The Utility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain utility subsidiaries. Average Loans to Utility Money Pool Average Loans to Utility Money Pool Average Loans to a Utility Money Pool during the period. The Utility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain utility subsidiaries. Net Loans (Borrowings) to/from Utility Money Pool Related Party Transaction, Due from (to) Related Party, Current Authorized Short-term Borrowing Limit Authorized Short Term Borrowing Limit Authorized Short-term Borrowing Limit by regulatory orders. Nonutility Money Pool Particpants' Money Pool Activity Nonutility Money Pool Participants Money Pool Activity [Abstract] Nonutility Money Pool Particpants' Money Pool Activity Abstract Maximum and Minimum Interest Rates Maximum and Minimum Interest Rates [Abstract] Maximum and Minimum Interest Rates. Maximum Interest Rate Maximum Interest Rate The maximum weighted-average interest rate of funds outstanding at that time, calculated on a daily basis, either borrowed from or loaned to a Utility Money Pool during the period. The Utility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain utility subsidiaries. Minimum Interest Rate Minimum Interest Rate The minimum weighted-average interest rate of funds outstanding at that time, calculated on a daily basis, either borrowed from or loaned to a Utility Money Pool during the period. The Utility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain utility subsidiaries. Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool Average Interest Rates for Funds Borrowed From and Loaned to Utility Money Pool [Abstract] Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool. Average Interest Rate for Funds Borrowed Average Interest Rate For Funds Borrowed The average interest rate for funds borrowed from a Utility Money Pool during the period. The Utility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain utility subsidiaries. Average Interest Rate for Funds Loaned Average Interest Rate For Funds Loaned The average interest rate for funds loaned to a Utility Money Pool during the period. The Utility Money Pool represents centralized funding mechanism AEP uses to meet the short-term cash requirements of certain utility subsidiaries. Maximum, Miminum, Average Interest Rates for Funds Borrowed from or Loaned to Nonutility Money Pool Maximum Minimum Average Interest Rates for Funds Borrowed From Loaned To Nonutility Money Pool [Abstract] Maximum, Minimum and Average Interest Rates for Funds Borrowed From or Loaned To Nonutility Money Pool Abstract Interest Expense [Abstract] Interest Expense [Abstract] Interest Income [Abstract] Interest and Other Income [Abstract] Interest income earned on advances to the Utility Money Pool Interest Income Earned On Advances Interest Income Earned On Advances. Short-term Debt: Short-term Debt [Abstract] Securitized Debt for Receivables Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount Commercial Paper Commercial Paper Line of Credit - Sabine Line of Credit, Current Total Short-term Debt Short-term Debt Securitized Debt for Receivables Short-term Debt, Weighted Average Interest Rate Commercial Paper Debt, Weighted Average Interest Rate Comparative Accounts Receivable Information Proceeds from Sale and Collection of Other Receivables [Abstract] Proceeds from Sale of Accounts Receivable Proceeds from Sale and Collection of Receivables Loss on Sale of Accounts Receivable Gain (Loss) on Sale of Accounts Receivable Effective Interest Rates on Securitization of Accounts Receivable Effective Interest Rates on Securitization of Accounts Receivable Effective interest rate on the amount owed for securitized accounts receivables. Net Uncollectible Accounts Receivable Written Off Net Uncollectible Accounts Receivable Written Off Net uncollectible accounts receivable written off. Customer Accounts Receivable Managed Portfolio Customer Accounts Receivable Managed Portfolio [Abstract] Customer accounts receivable managed portfolio. Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts Accounts receivables that have been pledged as collateral less uncollectible accounts as of the balance sheet date. Deferred Revenue from Servicing Accounts Receivable Deferred Revenue from Servicing Accounts Receivable Deferred revenue from servicing accounts receivable. Retained Interest if 10% Adverse Change in Uncollectible Accounts Retained Interest if 10 Percent Adverse Change in Uncollectible Accounts Retained interest if 10% adverse change in uncollectible accounts Retained Interest if 20% Adverse Change in Uncollectible Accounts Retained Interest if 20 Percent Adverse Change in Uncollectible Accounts Retained interest if 20% adverse change in uncollectible accounts. Derecognized Accounts Receivable Derecognized Accounts Receivable Derecognized accounts receivable. Total Principal Outstanding Principal Amount Outstanding on Loans Held-for-sale or Securitization or Asset-backed Financing Arrangement Delinquent Securitized Accounts Receivable Delinquent Amount at End of Period on Loans Managed and Securitized or Asset-backed Financing Arrangement Bad Debt Reserves Related to Securitization, Sale of Accounts Receivable Bad Debt Reserves Related to Securitized Sale of Accounts Receivable A valuation allowance for securitized receivables that are expected to be uncollectible. Unbilled Receivables Related to Securitization, Sale of Accounts Receivable Unbilled Receivables Related to Securitization, Sale of Accounts Receivable The amount of revenue for work performed for which billing has not occurred related to securitization of accounts receivable. Accounts Receivable and Accrued Unbilled Revenues Receivables Held-for-sale [Abstract] Accounts Receivable and Accrued Unbilled Revenues Receivables Held-for-sale, Amount Fees Paid to AEP Credit for Customer Accounts Receivable Sold Fees and Commissions [Abstract] Fees Paid to AEP Credit for Customer Accounts Receivable Sold Distribution and Servicing Fees Proceeds from Sale of Receivables Proceeds from Sale and Collection of Receivables [Abstract] Proceeds from Sale of Receivables to AEP Credit Proceeds from Sale of Finance Receivables Movement in Valuation Allowances and Reserves [Roll Forward] Movement in Valuation Allowances and Reserves [Roll Forward] Balance at Beginning of Period Valuation Allowances and Reserves, Balance Charged to Costs and Expenses Valuation Allowances and Reserves, Charged to Cost and Expense Charged to Other Accounts Valuation Allowances and Reserves, Charged to Other Accounts Deductions Valuation Allowances and Reserves, Deductions Balance at End of Period Financing Activities (Textuals) [Abstract] Financing Activities Textuals [Abstract] Financing Activities. Term Credit Facility Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases Reacquired Pollution Controls Bonds Held by Trustees Auction Rate Tax Exempt Long Term Debt Outstanding Securities that are debt instruments (corporate or municipal bonds) that typically have long-term nominal maturities for which the interest rate is reset through an auction process. Maximum Percentage Debt to Capitalization Maximum Percentage Debt to Capitalization Maximum level of debt to capitalization persuant to credit agreement leverage restrictions. Commitment from Bank Conduits that Expire in One Year Commitment from Bank Conduits that Expire in One Year Commitment from bank conduits that expire in one year. Commitment from Bank Conduits Including Seasonal Increase that Expire in One Year Commitment from Bank Conduits Including Seasonal Increase that Expire in One Year Commitment from bank conduits including seasonal increase that expire in one year. Commitment from Bank Conduits that Expire in Two Years Commitment From Bank Conduits That Expire In Two Years Commitment from bank conduits that expire in two years. Total Commitment from Bank Conduits to Finance Receivables Total Commitment From Bank Conduits To Finance Receivables Total commitment from bank conduits to finance receivables. Total Commitment from Bank Conduits Including Seasonal Increase to Finance Receivables Total Commitment from Bank Conduits Including Seasonal Increase to Finance Receivables Total commitment from bank conduits including seasonal increase to finance receivables. Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition Trust fund assets one time fee obligation for nuclear fuel disposition. Three-year Credit Facility Mandatory Redemption Percentage Range Minimum Mandatory Redemption Percentage Range Minimum Mandatory Redemption Percentage Range Minimum. Mandatory Redemption Percentage Range Maximum Mandatory Redemption Percentage Range Maximum Mandatory Redemption Percentage Range Maximum. Other long-term debt Other Long-term Debt, Noncurrent Interest Rate for outstanding long-term debt Debt Instrument, Interest Rate at Period End Commitment Provided by Previous Sale of Receivables Agreement Sale Of Receivables Agreement Previous Sale Of Receivables Agreement Previous. Receivables sales outstanding Receivables Sales Outstanding Receivables Sales Outstanding. Percentage of Adverse change in Uncollectible Accounts Percentage of Adverse change in Uncollectible Accounts one Percentage of Adverse change in Uncollectible Accounts. Percentage of Adverse change in Uncollectible Accounts Percentage of Adverse change in Uncollectible Accounts Two Percentage of Adverse change in Uncollectible Accounts. Accounts Receivable - Accounts Greater than Certain Defined Period Accounts Receivable - Accounts Greater than Certain Defined Period Accounts Receivable Accounts greater than Certain Defined Period. Commitments, Guarantees and Contingencies Commitments Contingencies and Guarantees [Text Block] Cash Flow Hedges, Tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Securities Available for Sale, Tax Other Comprehensive Income (Loss), Available-for-sale Securities, Tax Amortization of Pension and OPEB Deferred Costs, Tax Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax Pension and OPEB Funded Status, Tax Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax Variable Interest Entities Variable Interest Entities [Text Block] Variable interest entities disclosure Segment Reporting [Abstract] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Vertically Integrated Utilities [Member] Vertically Integrated Utilities [Member] Vertically Integrated Utilities [Member] Transmission And Distribution Companies [Member] Transmission And Distribution Companies [Member] Transmission And Distribution Companies [Member] AEP Transmission Holdco [Member] Transmission Operations [Member] Transmission Operations Member. Generation And Marketing [Member] Generation And Marketing [Member] Generation And Marketing [Member] AEP River Operations [Member] Aep River Operations [Member] AEP River Operations [Member] All Other [Member] Other Segments [Member] Consolidation, Eliminations [Member] Consolidation, Eliminations [Member] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments [Member] Operating Segments [Member] Reconciling Adjustments [Member] Intersegment Eliminations [Member] Significant Reconciling Items [Member] Segment Reconciling Items [Member] Reportable Segment Information Segment Reporting Information, Profit (Loss) [Abstract] Sales Revenue, Net Revenue, Net Revenues Revenues Income (Loss) Before Extraordinary Item Income (Loss) from Operations before Extraordinary Items EXTRAORDINARY ITEM, NET OF TAX NET INCOME (LOSS) Balance Sheet Information Segment Reporting Information, Additional Information [Abstract] Total Property, Plant and Equipment Property, Plant and Equipment, Gross TOTAL PROPERTY, PLANT AND EQUIPMENT - NET Property, Plant and Equipment, Net Total Assets Assets Long-term Debt Due Within One Year - Affiliated Affiliated Long Term Debt Current Total of the portions of the affiliated carrying amounts as of the balance sheet date of long-term debt, which may include notes payable, bonds payable, debentures, mortgage loans, and commercial paper, which are scheduled to be repaid within one year or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. Long-term Debt - Affiliated Affiliated Long Term Debt Noncurrent Sum of the affiliated carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. Business Segments (Textuals) [Abstract] Business Segments Textuals [Abstract] Business Segments Textuals. Percentage ownership interest of Transource Energy LLC Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest Reportable Segment Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Balance Sheet Information Segment Reporting Information Balance Sheet Information [Text Block] Segment Reporting Information Balance Sheet Information Text Block. Other Revenue [Member] Other Revenue [Member] Other Revenue. Utility Operations [Member] Utility Operations [Member] Utility Operations Member. Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Limit For Obligations Of Non Government Issuers [Member] Limit For Obligations Of Non Government Issuers [Member] Limit For Obligations Of Non Government Issuers Member Fixed Income Investments [Member] Fixed Income Investments [Member] Limits For Equity Investments [Member] Limits For Equity Investments [Member] Limits For Equity Investments Performance Share Units [Member] Performance Share Units [Member] Performance Share Units Employee Stock Option [Member] Employee Stock Option [Member] Restricted Stock Units [Member] Restricted Stock Units [Member] Restricted Stock [Member] Restricted Stock [Member] Minimum Range [Member] Minimum Range [Member] Minimum Range Maximum Range [Member] Maximum Range [Member] Maximum Range Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Nuclear Fuel [Member] Nuclear Fuel [Member] Pension Plan, Defined Benefit [Member] Other Postretirement Benefit Plan, Defined Benefit [Member] International [Member] International [Member] International Member. Amounts Attributable To Common Shareholders [Axis] Amounts Attributable To Common Shareholders [Axis] Amounts Attributable To Common Shareholders [Domain] Amounts Attributable To Common Shareholders [Domain] Amounts Attributable To Common Shareholders [Member] Amounts Attributable To Common Shareholders [Member] Basic and Diluted EPS Calculations Earnings Per Share [Abstract] Earnings Attributable to AEP Common Shareholders Net Income (Loss) Available to Common Stockholders, Basic Weighted Average Number of Basic AEP Common Shares Outstanding Weighted Average Number of Shares Outstanding, Basic Total Basic Earnings Per Share Attributable to AEP Common Shareholders Earnings Per Share, Basic Weighted Average Dilutive Effect of: Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] Weighted Average Dilutive Effect of Shares Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Dilutive Securities, Effect on Basic Earnings Per Share Dilutive Securities 1 Includes adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. Weighted Average Number of Diluted AEP Common Shares Outstanding Weighted Average Number of Shares Outstanding, Diluted Total Diluted Earnings Per Share Attributable to AEP Common Shareholders Earnings Per Share, Diluted Amounts Attributable to AEP Common Shareholders Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Income Before Extraordinary Item Income Before Discontinued Operations and Extraordinary Loss Income Before Discontinued Operations and Extraordinary Item Attributable to Common Shareholders. Discontinued Operations, Net of Tax Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Extraordinary Item, Net of Tax Extraordinary Item, Gain (Loss), Net of Tax, Attributable to Parent Net Income Net increase (decrease) in depreciation expense Net Increase Decrease in Depreciation Expense [Abstract] Net increase (decrease) in depreciation expense. Depreciation Expense Variance Depreciation Expense Variance Depreciation Expense Variance. Financial Impact of Asset Transfer [Abstract] Financial Impact of Asset Transfer [Abstract] Financial impact of asset transfer. Decrease in Total Assets Due to the Transfer of Cook Coal Terminal from OPCo to AEGCo Increase (Decrease) in Assets Due to Asset Transfer Increase (decrease) in assets due to asset transfer. Decrease in Total Liabilities Due to the Transfer of Cook Coal Terminal from OPCo to AEGCo Increase (Decrease) in Liabilities Due to Asset Transfer Increase (decrease) in liabilities due to asset transfer. Organization and Summary of Significant Accounting Policies (Textuals) [Abstract] Organization and Summary of Significant Accounting Policies Textuals [Abstract] Organization and Summary of Significant Accounting Policies. Amount Paid To Retire Certain Long Term Debt Amount Paid To Retire Certain Long Term Debt Amount Paid To Retire Certain Long Term Debt. Maximum original maturities of Cash and Cash Equivalents including temporary cash investments Maximum original maturities of Cash and Cash Equivalents including temporary cash investments Maximum original maturities of Cash and Cash Equivalents including temporary cash investments. Maximum holding period for Other Temporary Investments including marketable securities Maximum holding period for Other Temporary Investments including marketable securities Maximum holding period for Other Temporary Investments including marketable securities. Antidilutive Shares Outstanding Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Decrease in net-of-tax, basic earnings per share due to net change in depreciation rates Decrease in net-of-tax, basic earnings per share due to net change in depreciation rates Decrease in net-of-tax, basic earnings per share due to net change in depreciation rates. Percentage Owned in Ohio Valley Electric Corporation by APE Percentage owned in associate by parent company Percentage owned in associate by parent company. Percentage of ownership needed to account for investment using equity method Maximum percentage of ownership needed to account for investment using Equity method Maximum percentage of ownership needed to account for investment using Equity method. AEP Power Pool Purchases from OVEC Related Party Transaction, Expenses from Transactions with Related Party Percentage Ownership in Rockport Plant Unit 1 Percentage Ownership in Unit AEGCo's ownership interest percentage. Percentage Ownership in Rockport Plant Unit 2 Lease Percentage Ownership in Lawrenceburg Generating Station Percentage of Ownership in Generating Station AEGCo's percentage of ownership in the Lawrenceburg generating station. Extraordinary Item, Gross Loss Recorded in 2005 for Capacity Auction Extraordinary Item, Gain (Loss), Gross Extraordinary Loss, Net of Tax Recorded in 2005 due to Capacity Auction Disallowance Amounts Recorded Related to Capacity Auction True-Up Extraordinary Item, Gain (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Business Segments Segment Reporting Disclosure [Text Block] Income Statement [Abstract] Revenues Revenues [Abstract] Transmission and Distribution Utilities Electrical Transmission and Distribution Revenue Generation & Marketing Electrical Generation Revenue Sales to AEP Affiliates Revenue from Related Parties Other Revenues - Affiliated Related Party Transaction, Other Revenues from Transactions with Related Party Other Revenues TOTAL REVENUES Expenses Operating Expenses [Abstract] Fuel and Other Consumables Used for Electric Generation Electric Production Expense Purchased Electricity from AEP Affiliates Cost of Purchased Power from Affiliate Cost of electricity purchased as well as fuel used to generate electricity used in operations and sold during the reporting period from affiliate. Other Operation Maintenance Taxes Other Than Income Taxes Taxes, Miscellaneous TOTAL EXPENSES Operating Expenses OPERATING INCOME (LOSS) Operating Income (Loss) Other Income (Expense): Other Nonoperating Income (Expense) [Abstract] Interest and Investment Income Interest Income Investment Income, Interest and Dividend Carrying Costs Income Allowance for Equity Funds Used During Construction Interest Expense INCOME BEFORE INCOME TAX EXPENSE (CREDIT) AND EQUITY EARNINGS (LOSS) Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income Tax Expense (Credit) Equity Earnings (Loss) of Unconsolidated Subsidiaries Income (Loss) from Equity Method Investments INCOME (LOSS) BEFORE EXTRAORDINARY ITEM NET INCOME (LOSS) Net Income Attributable to Noncontrolling Interests NET INCOME (LOSS) ATTRIBUTABLE TO SHAREHOLDERS EARNINGS ATTRIBUTABLE TO COMMON SHAREHOLDERS Earnings Per Share WEIGHTED AVERAGE NUMBER OF BASIC AEP COMMON SHARES OUTSTANDING Income Before Extraordinary Item Income (Loss) from Operations before Extraordinary Items, Per Basic Share Extraordinary Item, Net of Tax Income (Loss) from Extraordinary Items, Net of Tax, Per Basic Share TOTAL BASIC EARNINGS PER SHARE ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS WEIGHTED AVERAGE NUMBER OF DILUTED AEP COMMON SHARES OUTSTANDING Income Before Extraordinary Item Income (Loss) from Operations before Extraordinary Items, Per Diluted Share Extraordinary Item, Net of Tax Income (Loss) from Extraordinary Items, Net of Tax, Per Diluted Share TOTAL DILUTED EARNINGS PER SHARE ATTRIBUTABLE TO AEP COMMON SHAREHOLDERS CASH DIVIDENDS DECLARED PER SHARE Common Stock, Dividends, Per Share, Declared New Accounting Pronouncements and Changes in Accounting Principles [Abstract] New Accounting Pronouncements Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Pronouncements Adopted New Accounting Pronouncements Adopted [Text Block] Restricted Cash for Securitized Funding Other Cash Deposits Restricted Cash and Cash Equivalents Advances to Affiliates Due from Related Parties, Current Accounts Receivable: Accounts Receivable, Net, Current [Abstract] Customers Accounts Receivable Customers Amounts due from customers for billed utility services. Affiliated Companies Accounts Receivable, Related Parties, Current Accrued Unbilled Revenues Unbilled Receivables, Current Pledged Accounts Receivable - AEP Credit Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount Miscellaneous Other Receivables Allowance for Uncollectible Accounts Allowance for Doubtful Accounts Receivable, Current Total Accounts Receivable Accounts Receivable, Net, Current Notes Receivable Due Within One Year - Affiliated Affiliated Accounts Notes And Loans Receivable Net Current The aggregate of amounts due from affiliates, within one year of the balance sheet date (or one operating cycle, if longer), for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date within one year of the balance sheet, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively. Materials and Supplies Other Inventory, Supplies, Gross Emission Allowances Emission Allowances Carrying amount as of the balance sheet date of emission allowances. Risk Management Assets Income Taxes Receivable Income Taxes Receivable Deferred Income Tax Benefits Deferred Tax Assets, Deferred Income Accrued Tax Benefits Income Taxes Receivable, Current Regulatory Asset for Under-Recovered Fuel Costs Regulatory Assets, Current Margin Deposits Margin Deposit Assets Deferred Cook Plant Fire Costs Deferred Cook Plant Fire Costs The carrying amount of deferred costs for the fire costs at the Cook Plant. Prepayments and Other Current Assets Prepaid Expense and Other Assets, Current TOTAL CURRENT ASSETS Assets, Current Generation Public Utilities, Property, Plant and Equipment, Generation or Processing Transmission Public Utilities, Property, Plant and Equipment, Transmission Distribution Public Utilities, Property, Plant and Equipment, Distribution Total Property, Plant and Equipment Other Noncurrent Assets Assets, Noncurrent [Abstract] Notes Receivable - Affiliated Affiliated Long Term Accounts Notes And Loans Receivable Net Noncurrent The aggregate of amounts due from affiliates more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money at a future date more than one year from the balance sheet date, reduced to their estimated net realizable fair value by an allowance established by the Company of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively. Regulatory Assets Securitized Assets Goodwill Goodwill Employee Benefits and Pension Assets Employee Benefits and Pension Assets Element represents the noncurrent asset recognized on the balance sheet that is associated with employee benefit and pension assets including, but not limited to, defined benefit pension plans, other postretirement defined benefit plans, deferred incentive compensation and other postemployment benefits. Deferred Charges and Other Noncurrent Assets Other Assets, Noncurrent TOTAL OTHER NONCURRENT ASSETS Assets, Noncurrent TOTAL ASSETS Advances from Affiliates Due to Related Parties, Current Accounts Payable Accounts Payable, Current Affiliated Companies Accounts Payable, Related Parties, Current Securitized Debt for Receivable - AEP Credit Other Short-term Debt Short-term Bank Loans and Notes Payable Risk Management Liabilities Customer Deposits Customer Deposits, Current Deferred Income Taxes Deferred Tax Liabilities, Net, Current Accrued Taxes Taxes Payable, Current Accrued Interest Interest Payable, Current Obligations Under Capital Leases Capital Lease Obligations, Current Regulatory Liability for Over-Recovered Fuel Costs Regulatory Liability, Current Provision for Refund Customer Refund Liability, Current Other Current Liabilities Other Liabilities, Current TOTAL CURRENT LIABILITIES Liabilities, Current Long-term Risk Management Liabilities Deferred Income Taxes Deferred Tax Liabilities, Net, Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits Regulatory Liability, Noncurrent Asset Retirement Obligations Asset Retirement Obligations, Noncurrent Employee Benefits and Pension Obligations Employee Benefits and Pension Obligations Element represents the noncurrent liability recognized on the balance sheet that is associated with employee benefit and pension obligations including, but not limited to, defined benefit pension plans, other postretirement defined benefit plans, deferred incentive compensation and other postemployment benefits. Obligations Under Capital Leases Capital Lease Obligations, Noncurrent Deferred Credits and Other Noncurrent Liabilities Other Liabilities, Noncurrent TOTAL NONCURRENT LIABILITIES Liabilities, Noncurrent TOTAL LIABILITIES Liabilities Rate Matters Rate Matters Describes all of the specific events that have or may impact rates and amortization of regulatory assets and liabilities (for example, pending or recently concluded regulatory proceedings, environmental requirements). Specifics may include quantifications related to rates, costs and earnings. Events may relate to rate moratoriums or price caps. Commitments and Contingencies Commitments and Contingencies Common Stock Common Stock, Value, Issued Paid-in Capital Additional Paid in Capital Retained Earnings Retained Earnings (Accumulated Deficit) Accumulated Other Comprehensive Income (Loss) TOTAL COMMON SHAREHOLDER'S EQUITY Stockholders' Equity Attributable to Parent Noncontrolling Interests Stockholders' Equity Attributable to Noncontrolling Interest TOTAL EQUITY TOTAL LIABILITIES AND EQUITY Liabilities and Equity Statement, Business Segments [Axis] Segment [Domain] All Other Segments [Member] Nonutility Operations - Generation and Marketing [Member] Nonutility Operations - Generation and Marketing [Member] Generation and Marketing Member. Muskingum River Plant Unit 5 [Member] Muskingum River Plant Unit 5 [Member] Muskingum River Plant Unit 5 Member Turk Plant [Member] Turk Plant [Member] Turk Plant Conesville Coal Preparation Plant [Member] Conesville Coal Preparation Plant [Member] Big Sandy Plant Unit 2 FGD Project [Member] Big Sandy Plant Unit 2 FGD Project [Member] Big Sandy Plant Unit 2 FGD Project Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] BlueStar Energy [Member] BlueStar Energy [Member] BlueStar Energy Member Acquisitions Dispositions and Discontinued Operations (Textuals) [Abstract] Acquisitions Dispositions and Discontinued Operations Textuals [Abstract] Acquisitions Dispositions and Discontinued Operations. Acquisitions of Assets Goodwill Intangible Assets Associated with Sales Contracts and Customer Accounts Indefinite-lived Intangible Assets Acquired Liabilities Associated with Supply Contracts Business Combination, Consideration Transferred, Liabilities Incurred Fair Value of MR5 Generating Unit Property, Plant, and Equipment, Fair Value Disclosure Asset Impairment on Related Material and Supplies Inventory Asset Impairment on Related Material and Supplies Inventory Asset impairment on related material and supplies inventory. Basis of Accounting Basis Of Accounting [Text Block] Description of the basis of accounting used to prepare the financial statements (for example, U.S. Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Earnings Per Share Earnings Per Share, Policy [Policy Text Block]